Heydon

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robinhouston

// gcc -g -Wall --std=c99 wilson.c -lpng -o wilson && ./wilson

/* Generate a random spanning tree of the RGB cube, and a random
   spanning tree of the pixel grid, using Wilson's algorithm, then
   do a simultaneous breadth-first search of these trees to obtain
   a bijection between the RGB cube and the pixel grid.

   Inspired by allrgb.com.

   -- Robin Houston, 2014-03

robinhouston

from PIL import Image

def splitnum(k, x):
    parts = [0] * k
    for n in range(24):
        parts[n % k] |= ((x >> n) & 1) << (n // k)
    return tuple(parts)

im = Image.new("RGB", (4096, 4096))
pix = im.load()