6. ImageOps invert

See: https://pillow.readthedocs.io/en/stable/reference/ImageOps.html#PIL.ImageOps.invert

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6.1. Invert

Use the ImageOps.invert(image) method to invert an image.

Only L and RGB images can be used.

from PIL import Image, ImageOps

with Image.open("test_images/cliffs.jpg") as im:
    im1 = ImageOps.invert(im)
    im1.save("imageOps/invert.png")