>>2214457Simplest (but grimiest) way would be selecting by color in gimp and simply painting over the reds, purples, greens, etc with one shade of each. this will look like shit though because it's gimp.
"Easiest" but way would be playing with the bitmap trace tool in inkscape to break it into shapes, break apart the paths and set each to the right colors. I put easiest in scare quotes because inkscape has already crashed 7 times in the 5 minutes I've been testing while typing up this reply.
So here's what you might get after a single scan brightness cutoff trace, cutting it where you want to switch colors (I cut them quite far from the right place so you could see them), breaking the paths apart, and coloring a few. At this brightness level, we get a decent hairpiece and a face that could be bucket filled. Expect to do one trace and cut for each two or three shapes. Ask any questions here or in the vector thread if you actually wanna do this. make sure to scale the image down to nothing larger than 1000x1000 before importing or it will take 6 million years to trace btw
