This is another of those things I knew how to do in PShop and am now trying
to duplicate in GIMP. I have a photo of a flowchart drawn in green marker
on a whiteboard. Photo taken with an iPhone, so quality is yuck. I brought
out the greens with Color Enhance, but now the white board has areas that
are yellow on the right and blue on the left.
How to target these "problem colors" and desaturate or otherwise move them
back to white?
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