One of the hardest things to do when reducing a high colour image down to VERY few colours is actually picking those colours. My original line remap code just used a histogram of most popular colours, took the top 4 and remapped each line to a palette of those. That's great for some images (lower colour source) but for high colour images with a lot of detail in it tends to lose a lot.
I'm now investigating original and modified diversity algorithms. Pretty simple code and it seems to sometimes produce an image that with dithering would turn out really nice. Other times it's nowhere near as good as that original most popular method.
I suppose I can leave all methods in the code and allow multiple passes, outputting an image for each and let the user decide. I'd also imagine most of these routines will produce a lot better result once a) dithering and b) PMG/mid scanline colours are added.
Pete
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A dev blog for my 8 bit retro machine developments.
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