pixels = W:1024 H:1024

x = from 0 to 4.0 W
y = from 0 to 4.0 H

k =  iq_voronoi2d(x, y)*0.5
k = k +  iq_voronoi2d(x*2, y*2)*0.25
k = k +  iq_voronoi2d(x*4, y*4)*0.125
k = k +  iq_voronoi2d(x*8, y*8)*0.0625

r = k
g = r
b = r
