pixels = W:512 H:512

x = from 0 to 1 W
y = from 0 to 1 H

f = 20
w = smoothstep(0.1, 0.9, x)
k = iq_fbm2(x*f, y*f)
h = x + w*k

c = pseudo_gt_rainbow(h)
r = parse_red(c)
g = parse_green(c)
b = parse_blue(c)
