I understand, I have been following this thread last few years.
That's why I'm surprised the smooth transitions of green translate so well with just few iterations.
Can't fool the eye on large patches of low-frequency green like for example the high-frequency dragon scales few posts above.
The problem is your over assumption of the source graphics in "thousands" of colors. Yes, Rayman, using the Jaguar version for example, used a 16-bit ~65,000 color mode, but that does not mean that they used all 65,000 colors or even a lot of progressive shades. The fact is that as a resolution of ~320x225, while it could fit 65,000 different colors on screen, it's not going to happen with a real image, instead of a bunch of colors. Those greens in Jaguar Rayman are really only about, I'll take a guess, 32-shades (if you can look at it on a big screen or with a magnifying glass close-up) that blend well. So reducing that to about 8 shades really isn't that big a loss. In both cases, the human eye can be fooled into seeing more color than there really is in a given image.
Most of the images I download and convert with Rasta, are in 24-bit true color, but if you load them into a paint program like Irfanview 64, most of those images do not consist of 16 million colors, they consist of only tens of thousands or even thousands, only the colors needed are used. So, I'm going to look at a screen shot of Jaguar rayman with Irfanview 64 and see just how many colors are really used at once...in the image below, a Jaguar screen shot, the actual amount of colors used out of 65,000 is 243205. And I know from experience, that if you take a screen shot with a camera (not saying the image below was taken that way), it can actually add colors that are not really there! If I do a Rastaconverter image that uses 64 colors, and then take a picture of it with my camera, and then load it into irfanview 64, guess what? it suddenly has thousands of colors registering! My point being that the 243205 from the Rayman screen-shot may in fact be much higher color than looking at the screen live. it's all relative.
Edited by Gunstar, Fri Dec 15, 2017 10:01 AM.