Many people, especially web developers need the color picker tool, which allows you, by clicking on the field on the computer screen, to show the color code.
Sorry for the spelling and phonetic errors in the text.
Owner and main writer of MintGuide.org is not a native English speaker.
Gpick supports exporting color palettes in formats gpl (Inkscape/Gimp), ase, mtl, and also import from formats gpl and ase.
In it still available a lot of different instruments, for example, you can even configure a css file.
It is possible that you will find something useful in this program.
Installation latest version into Linux Mint:
sudo apt-get install gpick
Remove from Linux Mint:
sudo apt-get remove gpick