pixels = W:1024 H:1024

x = from 0 to 16 W
y = from 0 to 16 H

k = gradient_noise2(x*1, y*1)*0.5
k = k + gradient_noise2(x*2, y*2)*0.25
k = k + gradient_noise2(x*4, y*4)*0.125
k = k + gradient_noise2(x*8, y*8)*0.0625
k = k + gradient_noise2(x*16, y*16)*0.03125

r = abs(k)*1.6
g = r
b = r
