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Batch processor of camera raw files supporting Adobe XMP profiles for film emulation

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# mini-film

`mini-film` is a complete photo-to-review-to-publish workflow for photographers
who want film-emulation output without opening Lightroom. It watches an inbox of
RAW, JPEG, HEIC, and TIFF files, develops images through RawTherapee when profiles are
configured, applies user-supplied film profiles and grain, serves a live review UI,
records ratings/tags/notes, and publishes the final selection with metadata
preserved.

The fastest way in is the desktop app:

```sh
mini-film
```

With no command, mini-film opens the native app wizard for the usual
daemon/review settings, profile selection, mounted-camera auto-import, Nikon WTU
ingest, lens corrections, output folders, and publishing defaults. The app
remembers the last successful setup, starts the same daemon pipeline used by the
CLI, waits for the embedded review server, and then opens the review UI in a
webview. Terminal output is still kept when launched from a shell, so
long-running processing stays inspectable. `mini-film app` remains available as
the explicit command form.

For scripted use, every part of the workflow is still available as CLI commands:
`apply`, `batch`, `daemon`, `panorama`, `sampler`, `pp3`, `info`, `nikon`, and
`update`.

## Screenshots

Main review view:

![mini-film main review view](https://sam.nakarmamana.ch/mini-film-ss-main.png)

Publishing workflow:

![mini-film publishing workflow](https://sam.nakarmamana.ch/mini-film-ss-publish.png)

Available shortcuts:

![mini-film shortcuts overlay](https://sam.nakarmamana.ch/mini-film-ss-shortcuts.png)

## Top Features

- **Single-binary desktop workflow**: `mini-film` provides a Tauri launcher
  with native directory pickers, a structured profile tree, saved options,
  network sharing toggle, Nikon WTU IP input, and system light/dark theme.
- **Live review and publish workflow**: run `daemon` on an inbox folder, open the
  browser UI, review new pictures as they arrive, rate/tag/label them in
  multiple passes, compare profile variants, and publish the final selection
  with live job progress. The review workflow is optimized for fast keyboard
  operation, while still supporting mouse, touch, and tablet use.
- **Mixed RAW and processed-file input**: batch, daemon, review, and publish can
  take RAW files plus existing JPEG/HEIC/TIFF files. Explicit profiles apply to
  all standalone inputs; without a profile, rendered inputs keep their existing
  look and skip RawTherapee. In daemon output, untouched processed originals and
  straight-out-of-camera sidecars are managed symlinks back to the input tree.
- **Panorama workflow**: select ordered pictures in live review, compare four
  projection previews, and render a full-resolution 16-bit TIFF that immediately
  re-enters the normal review and profile workflow.
- **Live profile sampler**: compare the current picture across the XMP
  emulation library, then add selected profiles to one picture or the whole
  review without restarting the daemon.
- **Optional Codex review assist**: let Codex analyze small embedded RAW
  previews after rendering finishes and fill tags, notes, or initial ratings
  while the live review UI shows the same queued/processing status indicators.
- **Film emulation from user-supplied profiles**: apply XMP emulation presets,
  Hald CLUT PNGs, or RawTherapee `.pp3` files; convert Adobe Camera Raw /
  Lightroom `crs:RGBTable` profile XMPs into cached 16-bit Hald PNGs.
- **Nikon WTU ingest**: pair with Nikon Connect-to-PC / Wireless Transmitter
  Utility mode over built-in camera Wi-Fi and feed transferred RAW and JPEG files
  directly into the daemon inbox.
- **Mounted-camera auto-import**: on Linux, `daemon --auto-import` continuously
  discovers mounted GVfs PTP/GPhoto2 and MTP cameras, imports every card into the
  flat inbox with durable duplicate tracking, and feeds arrivals into the normal
  review pipeline.
- **Batch, sampler, and gallery output**: process whole folders, render profile
  sampler sheets, and generate modern static HTML galleries.
- **RAW pipeline extras**: automatic Adobe Standard DCP matching with
  RawTherapee histogram-matched tone fallback, deterministic film grain,
  optional neutral film diffusion and highlight glow, optional high-ISO color
  denoise, optional RawTherapee lens corrections,
  metadata copyback with `exiftool`, 8-bit JPEG output, and 16-bit
  Zip-compressed TIFF output.

## Profile Library

mini-film does not include film profiles or emulations. It works with XMP, Hald,
and PP3 profiles already present on disk, including profiles created by the user
or obtained from commercial film-emulation products.

For XMP preset libraries, point `--profiles-root` at a directory with:

```text
profiles/     # internal RGBTable profile XMPs
emulations/   # user-facing emulation preset XMPs
```

## Quick Start

Apply one profile to one RAW, JPEG, HEIC, or TIFF image:

```sh
mini-film apply input.RAW \
  --profile 'Classic Film' \
  --profiles-root /path/to/profile-library \
  --output output.jpg
```

Batch-process a folder, accepting RAW plus JPEG/HEIC/TIFF inputs by default:

```sh
mini-film batch /path/to/photos /path/to/output \
  --profile 'Classic Film' \
  --profiles-root /path/to/profile-library \
  --long-edge 3840 \
  --progressive-jpeg
```

Use `--input-raw-only` or `--input-jpg-only` when a mixed input folder should be
filtered before processing. JPEG and HEIC are treated as the same processed-file
group for these filters; TIFF is accepted by the default unfiltered mode.

In the default mixed mode, a JPEG/HEIC with the same normalized stem in the same
folder as a RAW is treated as that RAW's straight-out-of-camera sidecar instead
of a separate picture. A trailing dash-number suffix is ignored for this match,
so `DSC_8313-1.jpg` pairs with `DSC_8313-2.dng`. The review UI shows it as an
unchecked `straight out of camera` profile thumbnail; if selected for publish,
its output uses the `-sooc` suffix. If the JPEG/HEIC reaches the review state
before the RAW, mini-film folds it into the RAW as soon as the RAW appears, and
performs the same cleanup when an existing SQLite review database is reopened.

Image files that are symlinks inside the input folder are treated like normal
input files, including review and publish rerenders.

Run the live review workflow:

```sh
mini-film daemon /path/to/inbox /path/to/output \
  --profile 'Classic Film' \
  --profile 'Soft Fade' \
  --profiles-root /path/to/profile-library \
  --review-address 0.0.0.0:8090
```

Then open `http://localhost:8090`, review pictures as they are processed, and use
the publish wizard to export the final album.

Run the desktop wizard instead of writing the daemon command manually:

```sh
mini-film
```

The app wizard defaults to `~/Pictures/Scratch/Inbox` for input,
`~/Pictures/mini-film` for output, and `MINI_FILM_PROFILES_ROOT` or the selected
profiles root for profile lookup. It remembers the last successful setup in
`~/.cache/mini-film/app-settings.json`. On Linux, enable **Auto-import mounted
cameras** to use the same continuous GVfs PTP/MTP discovery as daemon
`--auto-import`.

Use Nikon WTU ingest with the same daemon:

```sh
mini-film daemon /path/to/inbox /path/to/output \
  --profile 'Classic Film' \
  --profiles-root /path/to/profile-library \
  --review-address 0.0.0.0:8090 \
  --nikon-wtu 192.168.1.50
```

## Build

```sh
cargo build --release
```

The default build includes the Tauri desktop app so `cargo run --release` opens
the app from the normal binary. On Linux this requires the WebKitGTK development
packages used by Tauri. On Debian/Ubuntu/Linux Mint:

```sh
sudo apt-get install \
  libwebkit2gtk-4.1-dev \
  libjavascriptcoregtk-4.1-dev \
  libsoup-3.0-dev \
  libgtk-3-dev \
  libayatana-appindicator3-dev \
  librsvg2-dev \
  patchelf
```

To build the command-line binary without desktop GUI dependencies:

```sh
cargo build --release --no-default-features
```

Release builds stay portable across CPUs of the same architecture. Diffusion
selects supported SIMD kernels at runtime and falls back to its scalar kernels
when the required instruction set is unavailable. For a machine-local build,
explicitly opt into all instructions supported by that machine:

```sh
RUSTFLAGS='-C target-cpu=native' cargo build --release --no-default-features
```

GitHub releases publish both CLI artifacts and GUI artifacts. GUI artifact names
end in `-gui` before the platform extension, and GUI builds update from matching
`-gui` release assets.

Required external dependencies at startup for image-generation commands:

- `rawtherapee-cli`
- `convert` (ImageMagick/GraphicsMagick)
- `exiftool`
- `codex` only when daemon review analysis is enabled with `--codex`

Nikon Z9 High Efficiency/High Efficiency* NEFs, and other RAW files that
RawTherapee reports it cannot decode, can use Adobe DNG Converter through Wine.
This fallback is optional until one of those files is encountered. mini-film
looks for Adobe DNG Converter in `~/.wine-dng-mini-film`, `~/.wine`, and other
`~/.wine*` prefixes, and looks for `wine-stable` or `wine` in `PATH`. Override
discovery with `--adobe-dng-converter`, `--wine`, and `--wine-prefix`, or with
`MINI_FILM_ADOBE_DNG_CONVERTER`, `MINI_FILM_WINE`, and
`MINI_FILM_WINE_PREFIX`.

When that Wine prefix contains
`drive_c/ProgramData/Adobe/CameraRaw/CameraProfiles/Adobe Standard`, mini-film
automatically indexes those DCPs for RAW development. It matches source EXIF
against each DCP's internal `UniqueCameraModel`, normalizing case and separators
so Nikon EXIF `NIKON Z 7_2` matches Adobe's `Nikon Z 7 2`. Only profiles whose
internal name is `Adobe Standard` or `Adobe Standard vN` are eligible; the
highest version wins, while `Camera Default` and creative `Camera/` styles are
ignored. Missing, unreadable, unmatched, or ambiguous catalogs are a quiet
fallback.

A matched RAW uses the Adobe DCP as RawTherapee's input profile, including its
tone, look table, baseline exposure, and hue/saturation map with interpolated
illumination. In that case mini-film does not add histogram matching. Without a
match, the existing RawTherapee histogram-matched curve remains active. This is
automatic with no DCP flag. DCP profiles are never applied to JPEG, HEIC, or
TIFF inputs.

The fallback writes a same-stem `.dng` beside the source through a hidden
staging directory, verifies its lossless compression, raw-image digest, DNG
identity, dimensions, and `OriginalRawFileName`, preserves source filesystem
timestamps and permissions, and confirms the normal mini-film render before
permanently removing the replaced RAW. Existing validated DNGs are reused after
an interrupted run. Concurrent conversions use an OS-backed lock whose
ownership is released automatically if a daemon exits, so a restart does not
wait behind an orphaned marker.
Validation accepts zero-padded capture subseconds that
ExifTool emits as text instead of a JSON number, retaining their exact digits
for identity comparison. In daemon review mode the existing SQLite image row is
rebound to the DNG in place, so its image ID, ratings, labels, tags, notes,
retouch settings, profile selection, and related rows remain intact. A restart
also repairs a stored RAW path when its validated replacement DNG already
exists.

Panorama mode additionally requires the Hugin CLI suite: `pto_gen`, `cpfind`,
`cpclean`, `pto_var`, `autooptimiser`, `pano_modify`, `hugin_executor`, `nona`, and
`enblend`. The Panorama entry in review Tools stays hidden when that complete
suite is not available. Use `--hugin-bin-dir` or `MINI_FILM_HUGIN_BIN_DIR` when
those binaries are outside `PATH`.

The `update` command also requires `curl` for downloading the Lensfun database.

## Panorama

Stitch an explicit ordered set of RAW, JPEG, HEIC, or TIFF sources from the CLI:

```sh
mini-film panorama left.NEF middle.NEF right.NEF \
  --matching automatic \
  --projection cylindrical \
  --output sweep.tif
```

Matching strategies are `automatic`, `sequential`, `multi-row`, and
`flat-mosaic`. Output projections are `rectilinear`, `cylindrical`,
`equirectangular`, and General Panini (`panini`). Source preparation and Hugin
run with `--jobs N` threads; the default is half of the available CPU threads.
The command validates every required Hugin executable before preparing any
source and fails without creating an output when the suite is incomplete.

In daemon review, the bottom of the picture sidebar contains a small Tools
section on desktop and tablet, with Crop/rotate, Sampler, and Panorama. Phone
layouts do not show Tools. Panorama appears only when Hugin is available. The wizard stores
projects, ordered source relationships, projection previews, progress, and
errors as normalized SQLite rows. Interrupted work is preserved across restarts.
Preview stitching uses auto-oriented images with a maximum 2048-pixel long edge
and renders all four projections for comparison. The selected final projection
is rebuilt from full-resolution, 16-bit `RTv4_sRGB` TIFF sources. RAW preparation uses as-shot
white balance, the normal camera tone and optional lens/denoise corrections, but
does not apply a creative profile, grain, retouch, or sharpening.

Final review panoramas are written collision-safely to
`<input>/Panoramas/<name>.tif`, then added to review as ordinary TIFF input so
film profiles and TIFF sharpening can be applied once. Reusable working files
live under `<cache-root>/.mini-film-panoramas/`; cache keys include source path,
size, modification time, preparation settings, mini-film pipeline version, and
Hugin tool versions. The application remains one binary; Hugin, RawTherapee,
ImageMagick/GraphicsMagick, and ExifTool remain external executables.

## Coverage

Generate LCOV coverage locally (requires `cargo-llvm-cov`):

```sh
cargo install --locked cargo-llvm-cov
./scripts/coverage.sh
```

The script writes:

```sh
target/coverage/lcov.info
```

CI runs the same coverage step on every push/PR and uploads `coverage-lcov` as an artifact.

### Update

Use `update` to manually refresh the `mini-film` executable from
`https://github.com/alfanick/mini-film/releases` and rebuild/update the local
Lensfun profile database in `~/.cache/mini-film/lensfun`.

The command also mirrors Lensfun DB files into the platform default location
used by RawTherapee.

```sh
mini-film update
```

Update behavior is not automatic. Run it explicitly when a new release is
expected or before long sessions. The binary refresh still requires this crate to
be built with `--features github-update`; the Lensfun database refresh does not.

## Convert XMP Profiles To Hald

Convert one profile XMP:

```sh
cargo run --release -- hald \
  '/path/to/profile-library/profiles/Kodak Portra 400 normalised profile.xmp' \
  -o '../hald/Kodak Portra 400 normalised.hald.png' \
  --overwrite
```

Convert all profile XMPs under the parent directory:

```sh
cargo run --release -- hald /path/to/profile-library/profiles --overwrite
```

Ordinary emulation preset XMPs usually only reference a profile UUID and do not
contain the table payload; `hald` skips those in directory mode.

When `-o/--output` is omitted, `hald` writes generated Hald PNGs under
`$HOME/.cache/mini-film/hald`. Hald PNGs contain only the decoded RGBTable
lookup. Profile XMPs that include extra Camera Raw settings print
`adjustments=pp3` or `sharpening=pp3`; those settings are handled through
generated RawTherapee profiles during `apply`, `batch`, and `sampler`.

## Apply A Complete Film Recipe

Use a Lightroom emulation XMP that references an internal profile and defines grain:

```sh
cargo run --release -- apply input.RAW \
  --profile '/path/to/profile-library/emulations/Kodak Portra 400 warm grainy.xmp' \
  --profiles-root /path/to/profile-library \
  -o output.tif
```

If `--profile` is an emulation name, set `--profiles-root` to a folder that
contains `emulations/` and `profiles/`:

```sh
cargo run -- apply \
  --output /home/alfanick/test.jpg \
  --profile 'Agfa Scala 200 + grainy' \
  --profiles-root /path/to/profile-library \
  /home/alfanick/Pictures/Lightroom/2026/05/03/DSC_1812-10.dng
```

`output.tif` / `output.tiff` is exported as 16-bit Zip-compressed TIFF.

```sh
cargo run --release -- apply input.RAW \
  --profile '/path/to/profile-library/emulations/Kodak Portra 400 warm grainy.xmp' \
  --profiles-root /path/to/profile-library \
  -o output.jpg
```

`output.jpg` / `output.jpeg` is exported as 8-bit JPEG.

Use a human-edited RawTherapee profile directly:

```sh
cargo run --release -- apply input.RAW \
  --profile edited-profile.pp3 \
  -o output.jpg
```

When `--profile` points at a `.pp3`, mini-film passes that PP3 directly to RawTherapee. If the PP3 contains a `[Film Simulation]` section, RawTherapee applies its referenced Hald during RAW development. PP3-only profiles do not carry mini-film grain metadata.

Output metadata behavior for `apply`, `batch`, `daemon`, and `sampler`:

- source EXIF/IPTC fields are copied from the input RAW to the output file using
  `exiftool` (unless `--strip-metadata` is set)
- generated outputs are annotated with Adobe-style XMP Camera Raw settings
  (`XMP-crs`) for resolved mini-film profile adjustments, sharpening, HSL,
  calibration, tone-curve, and grain values where mini-film has real structured
  data for the render
- the XMP packet also records mini-film as the creator/converter and adds a
  high-level `xmpMM` history entry with the raw file, profile, linked profile,
  Hald or PP3 source, grain state, grain engine, grain seed, and
  grain-normalization reference, plus the effective diffusion method and
  parameters when enabled
- an EXIF comment is written as  
  `mini-film <version> usage=<command> profile=<profile-or-emulation>`
  or `profile=none` when no profile was configured

For direct JPEG/HEIC/TIFF inputs without a profile, source metadata is copied
from the rendered source and mini-film only adds its basic version/comment
marker and review/publish metadata. Profiled JPEG/HEIC/TIFF outputs receive the
same resolved profile, grain, and edit-history metadata as profiled RAW outputs.

## Batch Apply

Process every supported RAW file (`.dng`, `.nef`, `.cr2`, `.cr3`, `.arw`, `.raf`, `.orf`, `.rw2`, etc.) plus JPEG/HEIC (`.jpg`, `.jpeg`, `.heic`, `.heif`) and TIFF (`.tif`, `.tiff`) files under an input directory and write JPGs or 16-bit TIFFs under an output directory:

```sh
cargo run --release -- batch \
  /home/alfanick/Pictures/Lightroom/2026/05/03 \
  /home/alfanick/batch-output \
  --profile 'Agfa Scala 200 + grainy' \
  --profiles-root /path/to/profile-library \
  --output-format jpg \
  --jobs 8
```

The output directory is created if it does not exist. Nested input folders are
preserved, and each input uses the same relative path with a `.jpg` extension by
default. Use `--output-format tiff` to write `.tif` files through the 16-bit
Zip-compressed TIFF path. With `--profile`, standalone JPEG/HEIC/TIFF inputs use the
same PP3, Hald, grain, retouch, and black-and-white profile pipeline as RAW.
JPEG goes directly to RawTherapee; HEIC is first auto-oriented into a 16-bit
Zip-compressed TIFF. A final PP3 layer disables standard, edge, microcontrast,
capture, and post-resize sharpening for JPEG/HEIC inputs because these files are
normally already sharpened in camera; output XMP also omits profile sharpening
fields for these inputs. TIFF permits resolved profile sharpening because a
panorama enters the pipeline before creative output sharpening. In daemon
review, a straight-out-of-camera rendition
also appears as a profile and is excluded from publish until selected. Without
`--profile`, compressed inputs retain the direct resize/crop/rotation and
metadata-copy path. Camera tone matching, automatic ISO denoise, and lens
corrections remain RAW-only. During folder discovery, a JPEG/HEIC with a matching
RAW is treated as its straight-out-of-camera sidecar; only the RAW receives
profile renders.

By default, `batch` processes half of the detected CPU threads at once. On a 16-thread CPU that means 8 files in parallel. Override it with `--jobs N` when tuning for a different machine, output format, or memory budget.

`batch` shows two progress bars:

- total batch progress across files
- current file progress across RAW decode/Hald/grain or compressed-file export
  steps

### Batch Gallery

Pass `--gallery` to generate a gallery HTML from all successful batch outputs:

```sh
mini-film batch \
  /home/alfanick/Pictures/Lightroom/2026/05/03 \
  /home/alfanick/batch-output \
  --profile 'Agfa Scala 200 + grainy' \
  --gallery modern \
  --gallery-columns 4 \
  --gallery-thumbnail-long-edge 1024
```

`--gallery` accepts one of `modern`, `soft`, `compact`, `hero`, `phone`, or `all`.

Template intent:

- `modern`: masonry-like variable-cards layout with generous spacing and hero-like
  first-look cadence
- `soft`: editorial light look with warm spacing and caption emphasis
- `compact`: dense compact grid for quick scanning
- `hero`: story-focused layout with a large leading tile and balanced follow-ups
- `phone`: iOS/iPadOS photos style, dense square tiles
- `all`: render all five templates

Batch gallery options are folder-friendly and reuse the existing batch output tree
(including subdirectories). For a single template, the gallery is written as
`<output>/index.html` and uses `<output>/thumbnails/`.

`--gallery all` renders all five gallery templates into:

- `<output>/modern/index.html`
- `<output>/soft/index.html`
- `<output>/compact/index.html`
- `<output>/hero/index.html`
- `<output>/phone/index.html`

The template run reuses shared gallery assets under `<output>/thumbnails/` so
switching layouts does not reprocess or regenerate thumbnails.

## Daemon

Run a long-lived watcher that applies optional profiles whenever new files
arrive in an input folder. If no `--profile` is provided, each RAW is developed
once with RawTherapee defaults and JPEG/HEIC/TIFF inputs are converted directly.
When profiles are provided, each standalone RAW, JPEG, HEIC, or TIFF gets one output
per profile. Prepared HEIC TIFFs are reused from
`<cache-root>/.mini-film-profile-inputs/heic-v1/` across profile and retouch renders.
If a matching RAW exists, its JPEG/HEIC sidecar is never profiled separately.

```sh
mini-film daemon \
  /home/alfanick/Pictures/Lightroom/inbox \
  /home/alfanick/Pictures/mini-film-output \
  --profile 'Agfa Scala 200 + grainy' \
  --profile 'Portra 400' \
  --profiles-root /path/to/profile-library \
  --debounce-seconds 1 \
  --jobs 8 \
  --output-format jpg
```

The command validates configured profiles on startup, so mistyped `--profile`
values fail immediately. It watches the input directory recursively, waits for the file to
be reported as completed by the watcher (or a short fallback window when that
signal is not available), and writes each
result into:

```text
<raw relative structure>/<profile stem>/<raw stem>.<ext>
```

Without `--profile`, daemon output uses the raw-relative structure directly:

```text
<raw relative structure>/<raw stem>.<ext>
```

For example, `/in/2026/05/03/DSC_1864-14.dng` with profiles `Foil` and `Classic`
becomes:

- `/out/2026/05/03/Foil/DSC_1864-14.jpg`
- `/out/2026/05/03/Classic/DSC_1864-14.jpg`

If profile resolution fails for any selector, startup stops with a clear error.

`daemon` processes input files in parallel and defaults to half the available
CPU threads unless `--jobs` is set.

When live review is enabled, startup EXIF and camera maker-note indexing runs
with all available CPU threads. Metadata reads are cached by source path, size,
and modification time so queueing multiple profiles does not invoke ExifTool
again for the same unchanged image.

### Live Review

Add `--review-address` to expose a browser-based review UI while the daemon is
running:

```sh
mini-film daemon \
  /home/alfanick/Pictures/Lightroom/inbox \
  /home/alfanick/Pictures/mini-film-output \
  --profile 'Classic Film' \
  --profile 'Soft Fade' \
  --profiles-root /path/to/profile-library \
  --review-address 0.0.0.0:8090 \
  --gallery modern
```

The review server assets are compiled into the binary, so a release executable
does not need HTML/CSS/JS files next to it. The UI is live: the daemon records
new RAW, JPEG/HEIC, and TIFF files immediately, extracts an embedded camera preview when
available, then updates the browser over server-sent events as each render moves
from queued to processing to done. When no profiles are configured, the review UI
shows the developed RawTherapee-default output without a profile rail and direct
JPEG/HEIC inputs hide profile and retouch controls. With explicit profiles,
standalone JPEG/HEIC inputs expose the same profile rail, retouch controls,
black-and-white filters, and publish selection as RAW. Their camera rendition
appears in the rail as `straight out of camera`, unchecked for publish by
default. Daemon never copies an untouched JPEG/HEIC/TIFF into its normal output
tree. A direct compressed input is represented by a managed symlink at its
relative output path; a RAW sidecar or the camera rendition of a profiled
compressed input is a managed symlink under the `sooc` profile directory.
Links preserve the source media extension, with `.jpg` and `.jpeg` normalized
to `.jpg`. Startup replaces old generated copies and repairs stale links after
the input folder moves. Crop/rotation variants use files in the temporary review
cache, so the base original link remains intact.

Pending full-resolution daemon renders are reprioritized dynamically whenever
the current picture, selected profile, rating filter, rating, or profile
availability changes. Only enabled creative profiles participate; SOOC remains
eligible and can be the main profile when selected. For each profiled picture,
the main profile is its selected enabled profile, falling back to its first
enabled profile. A direct compressed picture's sole managed-link job is its
main render. The daemon dispatches pending work in this order:

1. the main profile of the current picture;
2. the remaining eligible profiles of the current picture;
3. the main profile of the other pictures visible under the current rating
   filter, in image order;
4. the remaining eligible profiles of those visible pictures, in image order;
5. the main profile of pictures outside the current rating filter, in image
   order;
6. the remaining eligible profiles of those remaining pictures, in any order.

Changing review state affects the next dispatch but does not interrupt a render
that is already processing. High-quality rerenders triggered by retouch or
profile-sidebar edits use a separate, debounced execution lane. Pending work
whose debounce has expired follows the same six-level priority order within
that reserved retouch lane, but executes independently from the daemon render
lane.

On restart, review reuses a completed profile render only when its RAW pipeline
and final export settings still match. Changing JPEG quality, resize or
long-edge bounds, subsampling, metadata stripping, or progressive JPEG mode
queues affected profile and retouch outputs again. Source-derived camera
previews, compressed thumbnails, and originals remain cached.

For standalone JPEG/HEIC, ordered background thumbnail and preview pipelines
start at discovery time and run concurrently with managed-link installation.
Each converter uses half of the available CPU threads; one thumbnail worker and
two preview workers keep review throughput high without overwhelming metadata
discovery. Jobs follow capture time and then file name, and each derivative
becomes available to the browser as soon as its cache file lands. The sidebar
uses progressive 512-pixel quality-55 thumbnails; the main viewer uses
progressive 2048-pixel quality-82 previews. In JPEG-only reviews it preloads the
next three previews at viewport sizes up to 2048 pixels and the next three
originals above that threshold. Both tiers are cached under
`<cache-root>/.mini-film-review-previews/compressed-v1/`. Direct compressed images
request the original input only when the loupe activates or the browser
viewport is larger than 2048 pixels; profiled compressed images use the
selected profile render for the main viewer and loupe. Holding the primary
mouse button or a touch shows the nearby loupe until release. On desktop,
double-clicking the picture toggles a full-view zoom that follows the mouse
cursor; double-click again or press Escape to leave it. In the desktop and
tablet layouts, direct
JPEG/HEIC inputs hide the unavailable Retouch section. RAW inputs paired with a
straight-out-of-camera JPEG/HEIC keep that section in place and disable it while
the straight-out-of-camera profile is selected, so switching profiles does not
shift the page layout. In the phone layout, direct JPEG/HEIC inputs hide the
unavailable Retouch action. All JPEG/HEIC inputs expose a Save Photo action for
the untouched source file. On
secure origins it opens the native file-share sheet, including iOS's Save Image
action; on plain LAN HTTP it opens the correctly typed original image for
Safari's image-save actions. The first
`--profile` is the default selected look for RAW and standalone compressed files
when profiles are configured. All configured profile variants are available and
selected for publish by default. A profile thumbnail's checkbox controls its
availability for that picture and keeps publish selection aligned; double-click
or double-tap a thumbnail to make it the only available profile.
Hover the filename in the review panel to see the source file size, pixel
dimensions, and megapixel count rounded to one decimal place.
When the source metadata contains a shutter count, hover the camera name in the
same panel to see `Shutter count: N`. Hover the focal length to see the lens
name when it is available. Hover the shutter speed to see the shutter mode and,
when enabled, silent photography. Hover the PSAM mode to see the release mode.
When Nikon Auto ISO is active, hover ISO to see `Auto ISO <= ISO N` with the
configured upper limit.

Multiple browsers can use the review page at the same time. The current picture
and minimum rating filter are server-owned shared state, so every browser shows
the same review position. Navigation, filter changes, keyboard ratings, and
rating-button clicks update that shared state and are replicated to every
connected browser through the server-sent event stream. At the end of a pass,
the shared filter moves to the next rating level.

Review data, panorama projects, and the shared browser position are persisted in
`<input>/mini-film-review.sqlite` as normalized relational rows. The output path
`<output>/mini-film-review.sqlite` is a managed symlink to that catalog, and
`<output>/originals` is a managed symlink to the complete input folder. On the
first mini-film 21.1 open, an existing regular catalog and any SQLite
WAL/journal companions are moved from output to input before SQLite opens; if
different catalogs exist in both locations, mini-film stops without modifying
either one. Subsequent daemon starts repair the catalog and `originals` links
when the input folder has moved.

The active database does not keep an opaque JSON copy of the review store.
SeaORM models own the schema and a migration ledger applies future database
changes automatically. Media paths in SQLite are stored relative to their input
or output/cache root, while the settings row records the last absolute roots
used to open the database. The roots supplied to `daemon` or `review-publish` are
authoritative, so an input tree and output tree can be moved and reopened at
their new locations without rewriting review data or cached-output
relationships. Existing schema-v15 absolute paths are converted transactionally
on first open; an unmappable path stops migration instead of being discarded.
Mounted-camera auto-import provenance uses the same catalog, with separate
relational rows for physical devices, cards/storages, capture groups, imported
assets, and remote source sightings.

Review caches use a catalog-specific system temporary directory, normally
`/tmp/mini-film.XXXXXX`; its absolute path is stored as `cache_root` in
`review_settings`. On the first mini-film 21.2 open, legacy `.mini-film-*`
cache directories and retouch files are moved out of output before workers
start. Old shared gallery thumbnails become ordinary `<output>/thumbnails/`
assets, and no `.mini-film-*` directories remain anywhere in output. Everything
under `cache_root` is optional: deleting the directory loses no ratings, edits,
profile choices, or panorama project state. The next open recreates the same
root when possible, and each missing derivative is generated on demand.
On its first open, mini-film 18 validates a normalized schema-v11
database from the final 17.x release, creates the one-time
`mini-film-review.sqlite.pre-seaorm-v11` backup without overwriting an existing
backup, adopts the database, and verifies that every reconstructed review value
still matches. SQLite integrity and foreign-key checks must also pass.

Mini-film 18 does not read legacy `mini-film-review.json` state or SQLite schema
versions 1 through 10. It rejects either format without modifying it; run the
final mini-film 17.x release once to convert that state to normalized SQLite v11,
then open it with mini-film 18. A human-readable audit trail of review, render,
and publish state changes is appended to `<output>/history.txt`. Together those
files make it possible to restart the daemon, reopen the browser, and continue
the multi-pass culling flow where it stopped. A typical pass is to rate
everything `0` or `1`, filter to `>= 1`, rate the survivors higher, and repeat
until the final subset is ready.

The review workflow is optimized for keyboard operation. Press `?` in the
browser UI to show the shortcuts overlay. `§` rates `0` and advances, `1`-`5`
rates and advances, arrow up/down changes the rating and advances, left/right
navigates without rating, `h` toggles the luma/RGB histogram in the workspace's
top-left corner on desktop, and `i` toggles camera focus points over the main
picture. Nikon AF area rectangles and 81-point phase-detect records are read
from MakerNotes, normalized through EXIF orientation, and transformed through
the active non-destructive crop and rotation. Pictures whose camera recorded no
focus location show no rectangles. PageUp/PageDown cycles the profile preview
for the current picture, Space enables or disables the selected profile, and
Escape leaves the tags or notes field without advancing. Double-click or
double-tap a profile thumbnail to make only that profile available. `6`, `7`,
`8`, `9`, and `0` toggle red, yellow, green, blue, and purple
labels without advancing; `r`, `y`, `g`, `b`, and `p` provide the same mnemonic
label toggles. `c` copies the current retouch slider adjustments, and `v` pastes
them onto another picture. While crop mode is open, `r` rotates the selected
crop ratio instead of toggling the red label.

The review UI stores rating, label, tags, notes, active preview profile, and
per-picture profile availability used by review and publish. RAW and explicitly profiled
JPEG/HEIC inputs support per-picture
retouch controls for exposure, contrast, highlights, shadows, whites, blacks,
as-shot color temperature, clarity, rotation, and crop. Contrast adjusts
RawTherapee's global Exposure contrast, while Clarity adjusts signed Local
Contrast. The temperature control is
centered on the camera's Kelvin value, and hovering `Temperature` shows the
camera white-balance mode when available. `Tint` is centered on the camera's
green/magenta white-balance fine-tune value. Moving either white-balance control
generates an effective custom RawTherapee white balance from those as-shot
values. Exposure, contrast, highlights, shadows, whites, blacks, and clarity
display the combined source-profile and emulation values for the selected
profile plus any manual per-picture adjustment. Manual edits remain stored as
deltas, so changing the selected profile updates those slider baselines without
applying profile values twice. Crop/rotate is opened from the sidebar Tools section on desktop and
tablet; Clear, Cancel, and OK join the rotation and aspect-ratio bar only while
crop mode is open. Direct JPEG/HEIC inputs without a profile do not expose
retouch controls. The browser applies a fast draft preview while edits are being
made, then queues a high-quality mini-film render and swaps in
the finished output when it is ready. Each ready profile card includes a `DL`
link; hovering it shows the rendered JPEG size in MB before downloading. Crop
and rotation are persisted with the review state and are used by publish
rerenders. Reopening crop mode shows an
uncropped camera preview or original SOOC image, with the finished crop aligned
over it, so an existing crop can be expanded or repositioned without losing the
discarded area. Crop ratios can be locked to the auto-oriented original frame,
`Free`, `4:3`, `5:4`, `A3/A4`, `1:1`, `16:10`, `21:9`, `3:1`, `4:1`, `5:1`,
or `6:1`; press `r` in crop mode to swap a locked ratio's orientation. The
`Free` preset lets each crop edge move independently. The A3/A4 preset uses the shared ISO
A-series `sqrt(2):1` paper ratio. The editable frame is constrained to the
largest black-corner-free area after rotation, so neither crop handles nor the
published result can include rotation triangles. Profile variants whose combined
source and emulation saturation is effectively black-and-white show `None`, `Y`,
`O`, `R`, and `G` filter controls beside the selected profile name. Those
black-and-white filter choices are stored per picture/profile variant and are
used by review and publish rerenders. Generated retouch and black-and-white
filter variants are cached under `<cache-root>/.mini-film-retouch/` so returning
to an already rendered variant swaps immediately.
When a completed RAW render used an Adobe DCP, `DCP used` appears beside the
selected profile name; hover it to see the exact DCP filename recorded for that
render.
Click the selected profile name to open the film simulation info overlay; it
shows profile identity, camera Active D-Lighting metadata for the current RAW,
and a compact summary of generated or direct PP3 adjustment sections. Its
collapsible `Complete PP3` section shows and downloads every PP3 layer applied
to that picture/profile in RawTherapee command-line order, including generated
retouch, black-and-white filter, ISO denoise, lens correction, and either the
matched Adobe DCP or auto-matched curve adjustment when active.

The Sampler tool is shown when the configured profile library contains XMPs
under `emulations/`. It prepares one reusable, auto-oriented 512-pixel 16-bit
neutral TIFF for the current RAW, JPEG, HEIC, or TIFF, plus a progressive JPEG
only for browser display. RAW preparation uses the normal camera tone,
denoising, and lens corrections without a creative profile or sharpening.
Sampler profiles cannot add sharpening to JPEG/HEIC sources; TIFF sources may
use profile sharpening. Current review retouch, white balance, crop, and
rotation are intentionally excluded from sampling.

Profile names use the same multi-level trie grouping as the `sampler` command,
including deeper film-speed and version branches. Sections start collapsed;
the deepest sections containing profiles enabled by the command line or a
previous Sampler selection open automatically, together with the ancestor path
needed to reveal them. Thumbnail rendering is asynchronous on half of the
available CPU threads: tiles currently visible in the sampler are queued first,
the direct tiles in each expanded section next, and collapsed branches continue
in the background. `Current` makes a rendered profile available only to the
active picture; `All` applies it to existing pictures and makes it the default
for future pictures. Command-line profiles are preselected and their `All`
setting is locked. Sampler-added profiles and both availability scopes are
stored in SQLite, survive daemon restarts even when omitted from later CLI
arguments, and use the ordinary full-resolution render path after selection.
Reusable inputs and thumbnails live under
`<cache-root>/.mini-film-sampler/review-sampler-v2-adobe-dcp/`; review HTML,
CSS, and JavaScript remain embedded in the single executable.

Optional Codex analysis can run after each image has a review preview and its
configured renders have finished. RAW inputs use the embedded camera preview;
JPEG/HEIC inputs get a temporary 640-pixel analysis preview instead of sending
the full-resolution output. Two Codex analyses run in parallel:

```sh
mini-film daemon \
  /path/to/inbox \
  /path/to/output \
  --profile 'Classic Film' \
  --profiles-root /path/to/profile-library \
  --review-address 0.0.0.0:8090 \
  --codex tags,note
```

`--codex` without a value defaults to tags only. Explicit values are
comma-separated: `tags`, `note`, `rating`, or `all`. Tags are normalized into the
same tag field used by manual review. Notes are one-sentence descriptions.
Ratings use a conservative `0` to `3` scale where `0` means technically
unusable, `1` technically correct, `2` interesting, and `3` truly good. Manual
edits always win: once a user changes tags, notes, or rating, later Codex
results do not overwrite that field. Camera ratings imported from RAW metadata,
including Nikon in-camera star ratings exposed by ExifTool as `Rating` or
Nikon/XMP rating tags, are protected from Codex rating updates too. While
analysis is queued or running, the existing review sidebar status dot/text and
the main profile status line show the Codex state.

The default model is `gpt-5.4-mini`, and review analysis runs it with isolated
low reasoning so unrelated user Codex settings do not make tagging slower or
incompatible. Override the model or binary path with:

```sh
--codex-model gpt-5.4-mini
--codex-binary codex
--codex-timeout 45
```

Publishing opens a wizard that acts as a browser frontend for a spawned
`mini-film review-publish` job. The wizard can filter by rating, color label,
and tags; choose a relative album folder inside the daemon output directory;
select JPG/TIFF output, original size or resize options, JPEG
quality/subsampling/progressive mode, grain engine and normalization settings,
and an optional gallery template.
Publish jobs run in parallel with the daemon job count, which defaults to half
the available CPU threads, and stream live progress back to every open review
browser.

The default publish settings match the daemon render settings, so publishing
uses hardlinks to the already-reviewed outputs when possible and falls back to
symlinks if hardlinks are not available. If output settings differ, mini-film
rerenders the selected pictures from the original RAW, JPEG, or HEIC inputs
through the normal `apply` pipeline before building the gallery. Changing the
grain engine, normalization reference, or normalization enabled state in the
publish wizard therefore also requires a rerender.

Published outputs are flat under the chosen album folder:

```text
<output>/<album>/<raw stem>.<ext>
<output>/<album>/<raw stem>-<profile stem>.<ext>
```

With no daemon `--profile`, published files use `<raw stem>.<ext>`. Otherwise,
the first daemon `--profile` is treated as the default profile and does not add a
profile suffix. Additional selected profiles add `-<profile stem>`. If a gallery
template is chosen in the wizard, publish renders an `index.html` gallery in the
album folder using the same templates as batch. Supported templates are
`modern`, `soft`, `compact`, `hero`, `phone`, and `all`. When publishing
finishes, the review wizard shows both `Open gallery` and `Download gallery`;
the download is one portable ZIP containing the HTML, gallery assets,
thumbnails, and full published images.

Published JPGs are annotated with review metadata through `exiftool`: rating,
label, tags, published profile, notes, and a mini-film version/comment marker.
The source RAW metadata and mini-film XMP edit metadata copied during normal
output generation are preserved unless `--strip-metadata` is used.

The same publish operation can be run directly from the CLI:

```sh
mini-film review-publish \
  --state /home/alfanick/Pictures/mini-film-output/mini-film-review.sqlite \
  --input-root /home/alfanick/Pictures/Lightroom/inbox \
  --output-root /home/alfanick/Pictures/mini-film-output \
  --album published/final \
  --min-rating 3 \
  --label green \
  --gallery modern
```

`--state` may use either the canonical catalog in the input folder or its
managed output symlink; both must resolve to the catalog for the supplied roots.

On Linux, daemon can import from cameras already mounted by GVfs:

```sh
mini-film daemon \
  /home/alfanick/Pictures/Lightroom/inbox \
  /home/alfanick/Pictures/mini-film-output \
  --review-address 127.0.0.1:8090 \
  --auto-import
```

`--auto-import` watches session D-Bus mount events and also reconciles the GVfs
mount directory periodically, so cameras connected before or during the daemon
run are discovered. PTP/GPhoto2 mounts and MTP mounts are supported, including
multiple cameras and multiple cards per camera. mini-film does not mount,
unmount, delete, or modify anything on a camera. The desktop session must mount
the device under `$XDG_RUNTIME_DIR/gvfs`; non-Linux builds reject this option
with a clear error.

Camera RAW and JPEG files are copied directly into the flat daemon input folder.
One transfer worker runs per physical camera, serializing that camera's cards;
different cameras import concurrently. The command line shows a dynamically
added byte-progress bar per camera. Transfers use a hidden same-filesystem
staging file, verify source size and modification time before and after copying,
sync the result, preserve its modification time, and publish without replacing
an existing destination.

Duplicate detection never hashes image contents. Within one physical camera,
the same case-insensitive filename and exact modification time is enough to
identify the same asset even when it appears on multiple cards. RAW/JPEG files
for the same capture share one destination stem. Across cameras, or when a
filename is reused with a different modification time, mini-film skips only a
strong EXIF match: `ImageUniqueID`, or capture time/subseconds/offset plus camera
serial. If EXIF differs or cannot establish identity, both files are preserved
with `-1`, `-2`, and later numeric suffixes. Existing inbox files with the same
filename and modification time are adopted on first use, which makes enabling
auto-import safe for an established inbox.

If Adobe DNG fallback later replaces an imported unsupported Nikon NEF, the
catalog retains the original camera filename and records the validated DNG as
its active successor. A later camera scan therefore does not reimport the
removed NEF. Interrupted transfers leave no final partial image and are retried
on a later reconciliation.

Daemon can also ingest files from a Nikon camera configured for
Connect-to-PC / Wireless Transmitter Utility style transfer. Start the camera's
connection wizard, make sure the computer can reach the camera address, then
point mini-film at that address. mini-film drives the Nikon pairing/auth step,
downloads RAW and JPEG files into the watched inbox, and processes them with the
normal daemon queue:

```sh
mini-film daemon \
  /home/alfanick/Pictures/Lightroom/inbox \
  /home/alfanick/Pictures/mini-film-output \
  --profile 'Classic Film' \
  --profiles-root /path/to/profile-library \
  --nikon-wtu 192.168.1.50
```

The Nikon WTU receiver is native PTP/IP over TCP port `15740`; it does not use
external camera-control tools. During first-time setup it requests the camera's
pairing code, accepts the wizard, completes pairing, reconnects, and then waits
for transferred RAW/JPEG objects. JPEGs follow the normal daemon rules: they are
reviewed directly when standalone, or merged as the straight-out-of-camera
sidecar when a matching RAW arrives. Unsupported transfer objects are consumed
silently so they do not block the camera's transfer queue. mini-film persists a
stable initiator GUID in `$HOME/.cache/mini-film/nikon-wtu-guid` unless
`--nikon-wtu-guid` is provided, and records successful camera pairings in
`$HOME/.cache/mini-film/nikon-wtu-pairings.json`. Later daemon runs reuse the
cached camera/name/GUID identity and go straight to transfer mode. If a camera
was previously paired to a different identity, remove that pairing on the camera
or reuse the same computer name/GUID with `--nikon-wtu-name` and
`--nikon-wtu-guid`.

## Profile Sampler Contact Sheet

`sampler` renders one thumbnail per XMP file from `emulations/` and builds a structured contact sheet grouped by shared profile-name prefixes. For example, Kodak profiles are shown under progressively deeper headings like `Kodak`, `Kodak Portra`, `Kodak Portra 400`, and `Kodak Portra 400 Grainy`; indentation makes the level visible. Each thumbnail is developed with its profile-specific generated RawTherapee `.pp3` files, including Film Simulation for the Hald, which applies the LUT during RAW development, before the grain stage. Like `batch`, sampler renders half of the detected CPU threads in parallel by default; override with `--jobs N`. Thumbnail longest edge defaults to 512 px:

```sh
--jobs 8
--thumbnail-long-edge 768
--jpg-quality 92
--no-grain
```

Sampler grain normalization uses each developed thumbnail's actual width and
height at the grain stage. Its existing small-thumbnail grain-amount
attenuation remains a separate sampler-specific adjustment;
`--no-normalize-grain` disables spatial normalization but does not disable that
amount attenuation.

Use a non-default convert binary or write a progressive sampler JPEG with:

```sh
--convert /path/to/convert
--progressive
```

## JPEG Export Options

`apply`, `batch`, and `daemon` support the same final JPG controls. `batch` and `daemon` also accept
`--output-format jpg|tiff`; TIFF batch output is written as 16-bit Zip-compressed `.tif`.
`sampler` supports `--jpg-quality`, `--jpeg-subsampling`, `--strip-metadata`, and
`--progressive` for generated sampler JPEGs, and accepts `.jpg/.jpeg` or `.html`
outputs (HTML mode produces a clickable gallery with lazy thumbnails).

```sh
--jpg-quality 90
--long-edge 3000
--jpeg-subsampling s444
--progressive-jpeg
--strip-metadata
```

Resize options:

- `--resize 3000x3000>` passes explicit GraphicsMagick resize geometry.
- `--long-edge 3000` constrains the longest edge to 3000 px.
- `--max-width 3000` constrains width only.
- `--max-height 2000` constrains height only.
- `--max-width 3000 --max-height 2000` constrains both dimensions.

Use one resize mode at a time: `--resize`, `--long-edge`, or `--max-width/--max-height`.

JPEG subsampling values:

- `s444`: best quality, no chroma subsampling
- `s422`: balanced horizontal chroma subsampling
- `s420`: smaller files with horizontal and vertical chroma subsampling

## Profile Selection

`--profile` is optional for `apply`, `batch`, `daemon`, and the desktop app. If
it is omitted entirely, mini-film asks RawTherapee to develop the RAW with its
default settings and does not apply Hald, PP3, profile adjustments, or
profile-derived grain. When provided, `--profile` accepts:

- a Hald PNG path
- a RawTherapee `.pp3` path
- an emulation XMP path containing `crs:Look` plus optional grain settings
- an emulation name, searched under `emulations/` using case-insensitive fuzzy matching
- a generated Hald name, searched under `--hald-dir`, which defaults to `$HOME/.cache/mini-film/hald`

RGBTable XMPs under `profiles/` are internal lookup tables. `apply`, `batch`, and `sampler` do not use them as user-facing emulations; they are only used to resolve linked `crs:Look` UUID/name references from emulation XMPs. `mini-film` generates or reuses a cached Hald from the linked profile under `$HOME/.cache/mini-film/hald`, generates temporary RawTherapee `.pp3` files for supported XMP adjustments and Film Simulation, lets RawTherapee apply the Hald, then applies the emulation grain settings.

## Profile Info

Print parsed details for a user-facing emulation or an internal RGBTable profile:

```sh
cargo run --release -- info \
  'Polaroid 600 v3 grainy' \
  --profiles-root /path/to/profile-library
```

`info` resolves emulation names under `emulations/`, direct emulation XMP paths, direct internal profile XMP paths, internal profile names under `profiles/`, and cached Hald PNGs under `--hald-dir`. For emulations, it prints the preset identity, linked Look, linked internal RGBTable profile, cached Hald path, profile-side tone/color/sharpening adjustments, and emulation-side grain/adjustments.

## RawTherapee PP3 Output

Print the generated RawTherapee PP3 for a profile:

```sh
cargo run --release -- pp3 \
  'Polaroid 600 v3 grainy' \
  --profiles-root /path/to/profile-library \
  --output polaroid-600-v3.pp3
```

`pp3` uses the same profile/emulation resolver as `info`. It writes to `/dev/stdout` by default, or to `--output`. The output contains the RawTherapee adjustment profile sections that mini-film would pass to `rawtherapee-cli`, followed by the Film Simulation section pointing at the cached Hald PNG.

## Nikon Picture Control Output

Fit an emulation XMP, internal RGBTable XMP, or Hald PNG into a Nikon classic `.NCP` Picture Control:

```sh
cargo run --release -- nikon \
  'Polaroid 600 v3 grainy' \
  --profiles-root /path/to/profile-library \
  --output polaroid-600-v3.ncp \
  --report polaroid-600-v3.ncp.txt
```

The `nikon` command writes a real classic NCP file using a neutral base Picture Control plus a fitted 257-point user-defined luminosity curve. It also estimates coarse saturation, hue, and sharpening fields from the profile. Use `--name 'Short Name'` to set the in-camera Picture Control name; NCP names are ASCII and short, so mini-film sanitizes and truncates them.

This is necessarily lossy. Nikon classic NCP does not store a full 3D LUT, RGBTable, Hald CLUT, or grain model. Color-specific film behavior is compressed into a 1D luma curve plus coarse sliders. Use the optional report to inspect mean/max luma and color error before trusting the result.

## Processing Split

RawTherapee handles:

- RAW development and Hald CLUT application through Film Simulation
- camera JPEG tone response, including visible Nikon Active D-Lighting effects,
  through RawTherapee histogram matching
- `Exposure2012`; `Contrast2012` maps to RawTherapee Exposure contrast;
  `Blacks2012`, `Shadows2012`,
  `Highlights2012`, and `Whites2012` map directly to RawTherapee Tone Equalizer
  bands 0, 1, 3, and 4, with its midtones band 2 left neutral
- `Saturation`, `Vibrance`
- `ToneCurvePV2012` and per-channel `ToneCurvePV2012Red/Green/Blue`
- `ParametricShadows/Darks/Lights/Highlights` and split points
- HSL `HueAdjustment*`, `SaturationAdjustment*`, `LuminanceAdjustment*`
- calibration-style `RedHue/RedSaturation`, `GreenHue/GreenSaturation`, `BlueHue/BlueSaturation`
- `Clarity2012` as signed RawTherapee Local Contrast with radius 80 and
  neutral darkness/lightness levels
- profile sharpening fields in generated `.pp3` files:
  `Sharpness`, `SharpenRadius`, `SharpenDetail`, `SharpenEdgeMasking`

Source-profile sharpening is applied before emulation sharpening. Explicit
emulation sharpening overrides the source, but an emulation that omits
sharpening preserves an explicit source setting. The minimal `5/0.6/10/0`
fallback is added only when neither layer defines sharpening. These settings
apply to RAW and TIFF renders; JPEG/HEIC profile renders append a final PP3
override that disables every RawTherapee sharpening stage.

mini-film internally handles:

- resolving emulation XMPs to internal RGBTable XMPs under `profiles/`
- decoding RGBTable payloads and generating RGBTable-only Hald PNGs
- optional film-like diffusion after simulation and before grain
- procedural grain from Lightroom grain fields

ImageMagick/GraphicsMagick `convert` handles:

- final resize, bit depth, metadata stripping, JPEG quality/subsampling, progressive JPEG, TIFF Zip compression, and TIFF/JPEG encoding
- structured sampler contact sheet rendering from mini-film's generated SVG layout

## Film Diffusion

Film-like diffusion is an optional mini-film stage after the RawTherapee/profile
simulation and before grain. It is off by default and uses a 16-bit TIFF
intermediate when enabled, including for final JPEG output. The look is neutral:
it does not add colored or warm halation. Enabled renders explicitly request
RawTherapee's `RTv4_sRGB` output profile, decode that transfer curve to linear
sRGB for diffusion, then restore the output ICC profile after export.

Choose one of two renderers:

- `multi-scale-mist` is the default and blends six resolution-normalized blur
  scales for gentle global softness and broad highlight spread.
- `edge-aware-glow` reduces fine luminance detail while preserving major edges,
  then redistributes bright highlight energy through a neutral veiling-glare
  point-spread function.

The implementation is independently calibrated from the published descriptions
in [ProMist-5K](https://arxiv.org/abs/2601.19295),
[Local Laplacian Filters](https://people.csail.mit.edu/hasinoff/pubs/ParisEtAl11-lapfilters-lowres.pdf),
the [fast local-Laplacian approximation](https://people.csail.mit.edu/hasinoff/pubs/AubryEtAl14-lapfilters.pdf),
and [Spencer et al.'s glare model](https://doi.org/10.1145/218380.218466).
No paper code or training/dataset material is bundled.

Use a preset or override its parameters independently:

```sh
--diffusion subtle
--diffusion medium --diffusion-method edge-aware-glow
--diffusion strong --diffusion-softness 60 --diffusion-glow 35 --diffusion-intensity 250
--diffusion medium --diffusion-softness-radius 175 --diffusion-glow-radius 275
--diffusion medium --diffusion-method edge-aware-glow --diffusion-highlight-reach 75
```

Presets are `off`, `subtle`, `medium`, and `strong`. They retain the selected
renderer and set all diffusion parameters:

| Preset | Softness | Glow | Softness radius | Glow radius | Intensity | Edge-aware reach |
| --- | ---: | ---: | ---: | ---: | ---: | ---: |
| `off` | 0 | 0 | 100% | 100% | 100% | 50 |
| `subtle` | 25 | 25 | 100% | 150% | 150% | 50 |
| `medium` | 50 | 50 | 150% | 225% | 225% | 60 |
| `strong` | 75 | 75 | 200% | 300% | 300% | 70 |

`--diffusion-softness` and `--diffusion-glow` accept `0..100`.
`--diffusion-softness-radius` and `--diffusion-glow-radius` accept `50..400`,
and `--diffusion-intensity` accepts `25..300`; these three values are
percentages of the renderer's calibrated radius or strength. Spatial radii use
the same 12 MP reference principle as normalized grain, so a 48 MP intermediate
uses twice the radius of a 12 MP intermediate before the radius percentage is
applied. `--diffusion-highlight-reach` accepts `0..100` and only affects
`edge-aware-glow`; higher values bloom a wider range of highlights. The review
wizard hides this control for `multi-scale-mist`. Every explicit flag overrides
the corresponding preset value.

In daemon review, the near-fullscreen Diffusion wizard previews both methods
with a full-frame before/after view and three paired detail views: the recorded
camera focus area, a high-contrast highlight, and a broad highlight. The focus
view uses the camera AF region after crop and rotation, falling back to the
picture center when no recorded AF region remains visible. Highlight views are
selected automatically and kept fixed while diffusion controls change, making
softness, radius, intensity, and glow easier to compare. The wizard groups the
sliders into Softening, Highlights, and Overall controls; Highlight reach is
shown only for the edge-aware renderer.

The Diffusion tool button is dark when effective diffusion is enabled for the
selected picture/profile.

The wizard offers two sampler-style scopes. **Apply to current** changes only
the current picture/profile pair. **Apply to all** makes the setting the current
profile's default for every existing and future picture, replacing prior
per-picture diffusion overrides for that profile. Current and all-profile
settings can be reset independently; otherwise the daemon command-line default
is inherited. Before/after previews and detail views reuse a cached,
2048-pixel, pre-grain profile render, so changing diffusion controls never
compounds or previews grain twice.

### Diffusion Benchmarks

The Criterion diffusion benchmark uses deterministic 16-bit RGB gradients,
fine checker texture, and a bright highlight. Image construction, cloning, and
the reported full-buffer checksum are outside the timed render. The default run
covers 2048x1365 review previews and the 4000x3000 12 MP reference with one
thread and all available threads. It measures both medium renderers, the two
edge-aware stages separately at 12 MP, and an `nproc/2` batch of concurrent
previews. This comprehensive run can take several minutes:

```sh
cargo bench --bench diffusion --no-default-features
```

Use a Criterion filter for a quick preview smoke measurement:

```sh
cargo bench --bench diffusion --no-default-features -- \
  'diffusion/preview-2048x1365/all-'
```

Enable the 8256x5504, 45.4 MP cases explicitly because they require much more
time and memory:

```sh
MINI_FILM_DIFFUSION_BENCH_FULL=1 \
  cargo bench --bench diffusion --no-default-features
```

Criterion prints pixels per second and a confidence interval around each time
estimate. It also stores detailed reports under `target/criterion/`. Save and
compare named baselines with:

```sh
cargo bench --bench diffusion --no-default-features -- \
  --save-baseline portable-before
cargo bench --bench diffusion --no-default-features -- \
  --baseline portable-before
```

To compare a portable build with the former machine-native build policy, save a
separate native baseline by setting `RUSTFLAGS` explicitly:

```sh
RUSTFLAGS='-C target-cpu=native' \
  cargo bench --bench diffusion --no-default-features -- \
  --save-baseline native-before
```

Build once before measuring peak resident memory, then wrap a filtered case
with GNU `time` so its `Maximum resident set size` describes one renderer and
size rather than the complete benchmark matrix:

```sh
cargo bench --bench diffusion --no-default-features --no-run
/usr/bin/time -v cargo bench --bench diffusion --no-default-features -- \
  'diffusion/reference-4000x3000/all-'
```

## RAW Development

`mini-film` uses RawTherapee as its only RAW engine. TIFF outputs and explicit `--keep-intermediate` runs render a 16-bit TIFF intermediate with:

```sh
rawtherapee-cli -q -Y [-p generated.pp3 ...] -o intermediate.tif -t -b16 -c input.RAW
```

JPEG-bound `apply`, `batch`, and `sampler` runs ask RawTherapee for an 8-bit JPEG intermediate instead:

```sh
rawtherapee-cli -q -Y [-p generated.pp3 ...] -o intermediate.jpg -j95 -js3 -c input.RAW
```

Sampler also adds a temporary RawTherapee resize profile so each RAW development produces a thumbnail-sized JPEG instead of a full-size TIFF.

When a Nikon RAW carries `ActiveD-Lighting`, mini-film keeps that MakerNote value
in review metadata and shows it in the film simulation overlay. The embedded
camera JPEG already includes Nikon's proprietary rendering, so the auto-matched
curve derives its tonal effect from the camera output. Mini-film does not stack
an additional synthetic D-Lighting curve on top of that match.

Use a non-default RawTherapee binary path with:

```sh
--rawtherapee /path/to/rawtherapee-cli
```

## Grain

Lightroom grain fields are read from preset XMPs:

- `crs:GrainAmount`
- `crs:GrainSize`
- `crs:GrainFrequency`

Grain is rendered internally after RawTherapee. TIFF outputs use the 16-bit
grain path; JPEG outputs use the optimized 8-bit grain path. The default engine
is `legacy`, mini-film's older additive procedural renderer.

By default, mini-film normalizes the engine's spatial grain structure against a
12-megapixel reference so the same profile keeps a comparable grain scale
across source resolutions. For the image dimensions that enter the grain stage,
the engine uses:

```text
linear_scale = sqrt(actual_grain_stage_pixels / (reference_mpix * 1_000_000))
```

At the default 12 MP reference, a 3 MP grain-stage image uses `0.5x`, a 12 MP
image uses `1x`, and a 48 MP image uses `2x`. The scale is applied to the
engine's spatial grain structure after its size/frequency mapping; grain amount
and deterministic seed are unchanged.

The actual grain-stage dimensions are the dimensions of the image mini-film
passes to the grain renderer. For normal `apply`, `batch`, daemon, review, and
publish rendering, that is the RawTherapee intermediate. Final export resizing
with `--resize`, `--long-edge`, `--max-width`, or `--max-height` happens after
grain and therefore does not change the normalization calculation. Sampler is
different because RawTherapee develops its thumbnail-sized intermediate before
grain.

Set another positive reference size with:

```sh
--normalize-grain 24
```

Disable spatial normalization and use the engine's unscaled spatial mapping
with:

```sh
--no-normalize-grain
```

The desktop launcher exposes the same setting as a checked **Normalize grain**
control with an editable **Grain Reference MPix** value, defaulting to `12`.

RFGR remains available as an opt-in engine. It is an original implementation
derived from the algorithm described in Newson, Faraj, Galerne, and Delon's IPOL
paper "Realistic Film Grain Rendering": an inhomogeneous Boolean model of random
disks, Gaussian filtering, and Monte Carlo sampling. It uses the existing
Lightroom-style `amount,size,frequency` controls, not new RFGR-specific knobs.
The implementation is derived from the paper's described algorithm and is not
copied from IPOL's GPL source archive.

RFGR engines detect visually monochrome developed images and switch to a shared
luminance grain path, so black-and-white exports do not get independent RGB
grain speckles.

For visual reference, see the
[grain engine comparison PDF](https://sam.nakarmamana.ch/mini-film-hidden/grain_engine_comparison.pdf).

Disable grain with:

```sh
--no-grain
```

Set deterministic variation with:

```sh
--grain-seed 42
```

When using a Hald PNG directly, pass grain manually:

```sh
--grain 30,45,45
```

or use a preset:

```sh
--grain-preset light
--grain-preset medium
--grain-preset heavy
```

Select the default legacy renderer explicitly with:

```sh
--grain-engine legacy
```

For a much faster cached approximation of the RFGR look, use:

```sh
--grain-engine rfgrfast
```

`rfgrfast` builds a seeded stochastic coverage cache for each RGB channel and
blurs it once instead of running the full per-pixel Monte Carlo disk sampler.
It still uses the same `amount,size,frequency` controls and the same
time-based or explicit grain seed flow, so batch/daemon/review outputs get
per-picture variation rather than reusing one fixed texture.

Select the exact RFGR engine explicitly with:

```sh
--grain-engine rfgr
```

## RAW Tone Matching

Every RAW render explicitly asks RawTherapee to generate an auto-matched tone
curve from the camera's embedded JPEG. Mini-film appends a partial PP3 layer
with `HistogramMatching=true` and `CurveFromHistogramMatching=false` after the
selected profile layers, so the behavior does not depend on the user's
RawTherapee preferences and a stale stored curve is not reused. This is the
same histogram-matching switch used by RawTherapee's bundled
`Auto-Matched Curve - ISO Low/Medium/High` profiles; mini-film handles ISO-based
denoising separately. JPEG and HEIC profile inputs do not receive RAW histogram
matching.

RawTherapee requires an adequately sized embedded preview for matching. If a
RAW has no usable preview, RawTherapee falls back to a linear curve.

## Color Noise Reduction

Since v3.1, `mini-film` can generate a short temporary RawTherapee pp3 block for
directional pyramid color denoising when source EXIF ISO is above a threshold.

- Controlled by `--color-noise-iso-threshold` on `apply`, `batch`, `daemon`, and
  `sampler`.
- Default threshold is `1600`.
- Set to `0` to disable color-noise processing.
- The ISO is read from raw EXIF; when no ISO is available, the step is skipped.

The thresholds use stepped levels:

- `ISO >= 25_600`: very strong color-denoise
- `ISO >= 6_400`: strong
- `ISO >= 1_600`: moderate (default threshold)
- below threshold: skipped

The denoise block is appended as an extra generated `[Directional Pyramid Denoising]`
section in the RawTherapee profile chain, after emulation/RAW adjustments and film
simulation and before mini-film procedural grain.

Example:

```sh
--color-noise-iso-threshold 1600   # default
--color-noise-iso-threshold 0      # disable
```

## RawTherapee Lens Corrections

Mini-film can optionally enable RawTherapee lens-correction controls. This is
off by default and available on `apply`, `batch`, `sampler`, and `daemon` via:

```sh
--lens-corrections
--lens-corrections all
--lens-corrections distortion,ca,vignetting
```

When no value is provided, `--lens-corrections` enables all supported items.
You can also pass any subset of:

- `distortion`
- `ca` or `chromatic-aberration`
- `vignetting` / `vignette`
- `all`

The generated section is inserted into the temporary pp3 stack as:

```ini
[LensProfile]
LcMode=lfauto
UseDistortion=<true|false>
UseVignette=<true|false>
UseCA=<true|false>
```

## Caveat

This does not fully clone Adobe Camera Raw. It decodes and applies the profile RGB table, maps supported profile tone/color/sharpening fields into generated RawTherapee `.pp3` files, uses RawTherapee for RAW development, and emulates Lightroom grain. Adobe-specific tone mapping, local contrast, sharpening, and camera matching may still differ.

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