Originally posted by Sendran
The hex values for the colours I take it are the right way to go?
I dunno, but the image is a GIF, using indexed color. In that format, a number in the format RRGGBB, for each pixel, can represent all the color resolution in the image, where RR, GG, and BB are hex numbers, each 00-FF (0-255 in decimal). I took the color values from the center of each patch (the edges fade a little).
So if the important info is the color at the center of each patch in the 19x2 grid, then representing them as hex numbers like that is a lossless translation.
(Hmm, a thought: it's an indexed color image, so the CLUT indices are additional information, too... don't think it would be that tricky, though...)