Please wait a couple seconds for the algorithm to do its stuff:)
More info
Rather than looping through every single pixel, this algorithm
counts the number of pixels in the canvas, and then generates
'random' x and y values to select 'random' pixels. Instead of
each pixel getting selected once, some will be selected multiple
times while others aren't selected at all. Every time a pixel is
randomly selected it increases the redness of that pixel. This
in essence will give us a 'heat map' to show us how spread out
the Mersenne Twister numbers are. A bad PRNG will have clumps or
areas that are 'hotter' than others and a good one will be quite
uniform.