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A command line tool to identify a pixel color of an X Window System screen

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# grabc
A command line tool to identify a pixel color on an X Window.

When this program is run, the mouse pointer is grabbed and changed to
a cross hair and when the mouse is clicked, the color of the clicked
pixel is written to stdout in hex prefixed with #

This program can be useful when you see a color and want to use the
color in xterm or your window manager's border but no clue what the
name of the color is. It's silly to use a image processing software
to find it out. (That's how I described it 20 years ago, so keeping it 
this way for historical reasons - Apr-11-2018).

# Synopsis

```
grabc v1.0.2
A program to identify a pixel color of an X Window
by muquit@muquit.com https://www.muquit.com/

Usage: grabc [options]
Where the options are:
 -v         - show version info
 -h         - show this usage
 -hex       - print pixel value as Hex on stdout
 -rgb       - print pixel value as RGB on stderr
 -W         - print the Window id at mouse click
 -w id      - window id in hex, use with -l +x+y
 -l +x+y    - pixel co-ordinate. requires window id
 -d         - show debug messages
 -a         - Print all 16 bits of color. Default is high order 8 bits
Example:
* Print pixel color in hex on stdout:
   $ grabc
* Show usage:
   $ grabc -h
* Print Window Id (Note the upper case W):
   $ grabc -W
* Print pixel color of Window with id 0x13234 at location 10,20
   $ grabc -w 0x13234 -l +10+20
```

# How to compile
Older version of this program is available on Ubuntu. However, if you need to get the latest version, you have to compile it yourself.

* You will need ```libx11-dev``` package if you are on Ubuntu. 
```
    sudo apt-get -y install libx11-dev
```
* To compile, at the shell prompt, type:
```
    make
```

* To install, at the shell prompt, type:
```
    sudo make install
```
The binary *grabc* will be install in /usr/local/bin/ and the man page *grabc.1*
will be installed in /usr/local/share/man/man1/

If you want to install it in some other directory:
```
    make DESTDIR=/tmp/grabc install
```

* If you want to create a debian package, install [fpm](https://github.com/jordansissel/fpm) first, then type:
```
    make deb
```

* Install the debian package:
```
    sudo dpkg -i ./grabc_1.0.2-1_amd64.deb
```

* To uninstall the debian package:
```
    sudo dpkg -r grabc
```

# Know Issues

* If color grabbed from root window, it might always show #000000 (Depending
on the Window Manager in use)

# ChangeLog

# v1.0.2
 * Was not working properly on Ubuntu Terminal. It was using default Colormap. Do not use default colormap, rather get it from window attributes. 
 * If could not get XImage from target window, it is probably root window,
    so try to grab it from there.
* Added some options
* Color can be grabbed from a specific location

* Change Copyright to MIT from GNU GPL

(Apr-10-2018)

# v1.0.1
* first cut

(march-16-1997)

# License

MIT

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