8. ImageOps solarize

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

8.1. Solarize

Use the ImageOps.solarize(image, threshold=128) method to return an image with all pixels above this greyscale level inverted.
threshold - All pixels above this greyscale level are inverted.
from PIL import Image, ImageOps

with Image.open("test_images/cliffs.jpg") as im:
    im1 = ImageOps.solarize(im, 50)
    im1.save("imageOps/solarize.png")
../_images/compare_solarize.png