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    • Øyvind Kolås's avatar
      swscale: add two spatially stable dithering methods · 3e601662
      Øyvind Kolås authored
      Both of these dithering methods are from http://pippin.gimp.org/a_dither/ for
      GIF they can be considered better than bayer (provides more gray-levels), and
      spatial stability - often more than twice as good compression and less visual
      flicker than error diffusion methods (the methods also avoids error-shadow
      artifacts of diffusion dithers).
      
      These methods are similar to blue/green noise type dither masks; but are
      simple enough to generate their mask on the fly. They are still research work
      in progress; though more expensive to generate masks (which can be used in a
      LUT) like 'void and cluster' and similar methods will yield superior results
      3e601662
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