contrast-ratio extension for gnome-shell

Calculate contrast ratio for readability based on WCAG 2.0 recommendations. If you have grabc installed, you can also capture color from your screen by clicking on the color preview.

This extension has been tested on gnome-shell 3.26 and 3.28. If you're using this extension in earlier versions of gnome-shell, please let me know so I can officially add it to supported versions.

Dependencies

If you want to capture color from a pixel on your screen, install grabc

apt-get install grabc

Now you can grab a hex color code from a pixel on your screen by clicking on the color box beside either the background color or text color.

Install

You can install contrast ratio from gnome extensions: https://extensions.gnome.org/extension/1430/contrast-ratio/

Install from git

git clone https://github.com/larissa/contrast-ratio.git ~/.local/share/gnome-shell/extensions/[email protected]

Restart the shell and then enable the extension.

Known issues

Picking a color from anywhere on screen is not supported on wayland for security reasons, so grabc (and any other color picking tool) won't work if you're using wayland.