Выбор цвета и редактор палитры - Color selector and palette editor
[ О приложении ]

KColorChooser is a color palette tool, used to mix colors and create custom color palettes.
Using the dropper, it can obtain the color of any pixel on the screen.
A number of common color palettes are included, such as the standard Web colors and the Oxygen color scheme.

Источник
Репозиторий: flathub

FlatPak: KColorChooser [Graphics & Photography]