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Get the color of any screen pixel in an X11 environment
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README.md

pixel-pick

Get the color of any screen pixel in an X11 environment.

Simple command-line app to allow you to get the RGB color of any screen pixel in an X11 environment, even those controlled by another application.

Install

zef install App::pixel-pick

Needs to have the import utility available. Installed part of the MagickWand package. Most Linuxes have it already, if not, install libmagickwand. May want to install libmagickwand-dev as well, though it isn't strictly necessary for this app.

Use

Interactive:

pixel-pick

If invoked with no parameters, runs in interactive mode. Will get the color of the pixel under the mouse pointer and show the RGB values in both decimal and hexadecimal. Will display a small block colored to that value. Updates (moderately) slowly as the mouse is moved. There is some delay just to slow down the "busy" loop of checking to see if the mouse has moved. Will not attempt to update if the mouse has not moved. Uses the X11::xdo module to capture mouse motion so will only work in an X11 environment.

Note that screen sub-pixel dithering may lead to some unexpected values being returned, especially around small text. The utility returns what the pixel color is, not what it is perceived to be.

When in interactive mode, you need to send an abort signal to exit the utility. Control-C will reset your terminal to its previous settings and do a full clean-up. If you want to keep the color block and values around, do Control-Z instead. That will also reset the terminal, but will not clean up as much, effectively leaving the last values displayed.

Non-interactive: (Get the color of the pixel at 100, 200)

pixel-pick 100 200

If invoked with X, Y coordinates, runs non-interactive. Gets the pixel color at that coordinate and exits immediately, doing the partial cleanup as you would get from Control-Z.

Non-interactive, quiet: (Get the RGB values of the pixel at 100, 200)

pixel-pick 100 200 q

Add a truthy value as a "quiet" parameter to not return the standard color parameters and block. Only returns the RGB values in base 10 separated by colons. EG. RRR:GGG:BBB

If you would prefer to receive hex values, use an 'h' as the quiet parameter. Returns the RGB values in hexadecimal, separated by colons; RR:GG:BB.

pixel-pick 100 200 h

Author

2019 thundergnat (Steve Schulze)

This package is free software and is provided "as is" without express or implied warranty. You can redistribute it and/or modify it under the same terms as Perl itself.

License

Licensed under The Artistic 2.0; see LICENSE.

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