Add a COLOR PICKER to Palette.
Matching a color of a logo for example must be done manually, using fine adjusting option and calibrating HSV values. But some colors are pretty hard to catch.
Heres a reference to some of the tools/guides painters use currently.
Forza Documentation [History, Guides, and More] - #5 by Oliver0023
As for the color matcher they do exist already. Check out @PJTierney 's forum post which is also linked in the forums link I had sent above.