6. Image getextrema

See: https://pillow.readthedocs.io/en/stable/reference/Image.html#PIL.Image.Image.getextrema

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6.1. Getextrema

Use the Image.getextrema() method to return the minimum and maximum pixel values for each band in the image.

For a single-band image, it returns a 2-tuple containing the minimum and maximum pixel value.

For a multi-band image, it returns a tuple containing one 2-tuple for each band.

from PIL import Image

with Image.open("shapes/box.png") as im:
    print(im.getextrema())
    # ((255, 255), (127, 255), (39, 255), (0, 255))