chickadee » leptonic » pix-dither-2bpp

pix-dither-2bppprocedure
  • in - PPIX - 8bpp/graymap
  • in - CMAP? - generate colormap? 0=no, 1=yes
    • Dithers to equally spaced gray values at 0, 85, 170, 255
  • returns: dithered ppix or #f if error.