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  • \$\begingroup\$ Can you share an example? I believe this is random dithering, and the results are not the cleanest...nice profile picture though \$\endgroup\$ Commented May 3, 2014 at 22:12
  • \$\begingroup\$ This is indeed random dithering, and I'm making an example of your sample picture at the moment. \$\endgroup\$ Commented May 3, 2014 at 22:15
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    \$\begingroup\$ I think it might benefit from a contrast boost. I don't know python, but I assume random.randint(0,255) is picking a random number between 0 and 255. Try limiting to between say 55 and 200, which will force any shades outside that range to be pure black or white. With many pictures you can get a good, striking image with no dithering, just a simple threshold. (Random + contrast boost would give an image intermediate between your current image and simple threshold.) \$\endgroup\$ Commented May 3, 2014 at 22:56
  • \$\begingroup\$ I think random dithering should be called Geiger dithering (because it looks like a Geiger counter's output). Who agrees? \$\endgroup\$ Commented May 4, 2014 at 18:04
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    \$\begingroup\$ That's almost precisely what ImageMagick and GraphicsMagick do with the "-random-threshold" option that I added along with "-ordered-dither" years ago (added to my answer). Again, bumping the gamma helps with getting the right intensity. I agree with the "Geiger dithering" suggestion. \$\endgroup\$ Commented May 4, 2014 at 19:48