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Not sure if it is what was used, but there is a Bill Atkinson dither for HTML canvas here https://ipenburg.home.xs4all.nl/atkinsome/ https://ipenburg.home.xs4al

• lioeters 7y ago
  Nice one! Found the source for the first linked page: https://github.com/ipenburg/Atkinsome https://github.com/ipenburg/Atkinsome The script is about 8 years old and depends on MooTools, but shouldn't be too hard to modernize it. Here's a newer implementation of the Atkinson dither algorithm on Node.js. https://github.com/rtrvrtg/node-atkinson-dither https://github.com/rtrvrtg/node-atkinson-dither Edit: This dither library includes Atkinson: https://github.com/danielepiccone/ditherjs https://github.com/danielepiccone/ditherjs