[RFC] libsixel-specific error diffusion (dithering) to improve sixel compression #206
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…mpression by steering error propagation so out-of-palette intermediate colors render as horizontal bands rather than grainy noise, we increase RLE more effective.
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I propose a new dithering option
-d lso1.It gently steers error diffusion so that grainy noise turns into faint horizontal bands, improving SIXEL RLE compressibility at a slight perceptual cost.
Effects are modest compared to
-E size; expected size reductions are only a few percent.