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    \$\begingroup\$ Is there any reason to limit file formats to JPG and requiring I/O to be through files, other than punishing/eliminating languages without image and file system manipulation libraries? Why not allow any true-colour raster format (so that one could use PPM for instance), and I/O as byte streams through STDIN/STDOUT? \$\endgroup\$ Commented May 17, 2015 at 0:04
  • \$\begingroup\$ @MartinBüttner: Is that better? \$\endgroup\$ Commented May 17, 2015 at 0:05
  • 2
    \$\begingroup\$ Yeah much better, although you still require I/O to be through files. \$\endgroup\$ Commented May 17, 2015 at 0:06
  • \$\begingroup\$ Per-pixel, it's supposed to use the nearest color in the list by the euclidean metric on RGB values. \$\endgroup\$ Commented May 17, 2015 at 0:09
  • 1
    \$\begingroup\$ Note that this is called posterization or color quantization. \$\endgroup\$ Commented May 17, 2015 at 1:05