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I don't remember the math, but the colors are a direct translation of per-pixel values that don't translate nicely to colors. It's not really a very useful view.
I don't know what "doesn't work" means, but you should be able to see a difference in any image with noise (screening, JPEG) with the default settings if you zoom in, and it'll get very obvious if -p is turned down.
petopeto
I don't know what "doesn't work" means, but you should be able to see a difference in any image with noise (screening, JPEG) with the default settings if you zoom in, and it'll get very obvious if -p is turned down.