Images containing every color of their RGB color space exactly once.
I wrote the scripts to generate these in Processing, using various algorithms for which colors and parts of the image got matched first.
Most of these are 18-bit, so they have 262,144 colors, but the first one is a thumbnail of a 24-bit image, which has 16,777,216 colors and is 48 megabytes.
Getting it down from 30 minutes of processing time for an ugly image to 5 minutes for one that looks good was a challenge. You can see the full image here!
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