controls
q...i - hilbert sfc dithering with different q
o - 4 color noise diffusion
p - 2 color noise diffusion
a..j - noise diffusion with arbitrary number of gray shades
k - Bill Atkinson's B/W dither
l - Bill Atkinson's COLOR dither
m - grayscale image for reference
spacebar - reset image
Source code: pgr_sfc_dithering
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