On this image you can see the error diffusion dither w/ palette pruning selects some more accurate beiges at the top of the background, but towards the bottom the red/orange chicken suit costume forces more saturated reds, oranges, and greens into the dither pattern.
Current code is proof of concept spaghetti JS; next step will be to rewrite it in clean Rust I can run in my build step to make the Atari executable.