mate-color-select man page
mate-color-select — Select a color from a palette or from screen
The mate-color-select program is a tool to pick a color from a color palette or from screen. It is not meant to be used on its own, but as a MATE Desktop helper application.
The mate-color-select tool supports all known GTK options, but has no options of its own.
If you find bugs in the mate-color-select program, please report these on https://github.com/mate-desktop/mate-desktop/issues.