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gemini image watermark remover

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# Watermark Remover

A local, privacy-first tool to remove Gemini AI and Nano Banana watermarks from images. All processing happens in your browser - your images never leave your device.

## Features

- 🔒 **100% Local Processing** - Images are processed entirely in your browser
- ⚡ **Instant Results** - No upload delays, immediate watermark removal
- 🎯 **Mathematical Precision** - Uses reverse alpha blending, not AI guessing
- 🌍 **Multi-language Support** - English, 中文, 日本語, 한국어
- 📱 **Responsive Design** - Works on desktop and mobile

## How It Works

This tool uses **Reverse Alpha Blending** to mathematically recover the original pixels from watermarked images.

The formula used:
```
Original = (Watermarked - α × Logo) / (1 - α)
```

Where:
- `Watermarked` is the pixel value in the watermarked image
- `α` (alpha) is the transparency value from the watermark
- `Logo` is the watermark color (white, 255)

## Tech Stack

- **Vue 3** - Composition API with `<script setup>`
- **Vite** - Fast development and build
- **vue-i18n** - Internationalization
- **Lucide Vue** - Beautiful icons

## Getting Started

### Prerequisites

- Node.js 18+
- pnpm (recommended) or npm

### Installation

```bash
# Install dependencies
pnpm install

# Start development server
pnpm dev
```

### Build for Production

```bash
pnpm build
```

The built files will be in the `dist` directory.

## Scripts

| Command | Description |
|---------|-------------|
| `pnpm dev` | Start development server |
| `pnpm build` | Build for production |
| `pnpm preview` | Preview production build |
| `pnpm format` | Format code with Prettier |
| `pnpm format:check` | Check code formatting |

## Project Structure

```
src/
├── components/
│   ├── Header.vue      # Navigation with language switcher
│   ├── Main.vue        # Image upload and processing
│   ├── Guide.vue       # How it works section
│   ├── Footer.vue      # Copyright footer
│   └── Toast.vue       # Notification component
├── composables/
│   └── useToast.js     # Toast state management
├── i18n/
│   └── index.js        # Translations (en, zh, ja, ko)
├── utils/
│   └── watermarkRemover.js  # Core watermark removal logic
├── assets/
│   ├── bg_48.png       # Alpha map for small images
│   └── bg_96.png       # Alpha map for large images
├── App.vue
├── main.js
└── style.css
```

## Supported Watermarks

- Gemini AI generated images (48x48 and 96x96 watermarks)
- Nano Banana watermarks
- Any watermark using similar alpha blending technique

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