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You can now do ordered dithering, and you can mix it with error diffusion in varying amounts. The last panel uses both at 100%, and you can see how error diffusion is necessary to bring out subtle colors.
Star Trader was included in "What To Do After You Hit Return", a large-format book published by People's Computer Company, with listings in HP BASIC format. Check out this groovy cover art!
NES 5-color experiment (right). Each 16x16 area has to choose one color to leave out.