3. ImageChops add_modulo

See: https://pillow.readthedocs.io/en/stable/reference/ImageChops.html#PIL.ImageChops.add_modulo

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3.1. Add modulo

Use the ImageChops.add_modulo(image1, image2) method to add two images, without clipping the result.

out = ((image1 + image2) % MAX)

from PIL import Image, ImageChops

with Image.open("test_images/crosses.png") as im1:
    with Image.open("test_images/circles.png") as im2:
        im_out = ImageChops.add_modulo(im1, im2)
        im_out.save("chops/add_modulo.png")