moire.py

#!/usr/bin/env python3

from PIL import Image
from math import sin, cos, pi

width = 1440
height = 800
midw = width / 2
midh = height / 2
lesser = min(midw, midh)

img = Image.new("RGB", (width, height), color=0)

for x in range(width):
    for y in range(height):
        dist = (((x - midw)**2 + (y - midh)**2) **.5) / lesser
        val = cos((2** (dist* 2)) * pi * 10)
        val = round((val + 1) * 255 / 2)
        img.putpixel((x, y), (val, val, val))


img.save("img.png", "PNG")