Another environment from the game, Old Ebonheart.
-err_detect ignore_err \
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As a final tweak, I moved from 8 bit ansi colors like \x1b[38:5:161m to 4 bit colors like \x1b[31m. This restricts our color range, but it saves something like 6 bytes per color.
By appropriately scaling the perturbation amount for each colour channel separately, we can also extend this to work with palettes where is different for each colour component, provided that they are still regularly spaced. Unfortunately, the less regular the palette is, the less effective this technique becomes. If we wish to leverage the strengths of ordered dithering for use with irregular or arbitrary palettes, a more general solution is needed.