3. Image getbbox

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

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3.1. Getbbox

Use the Image.getbbox() method to return the bounding box of the non-zero regions in the image.

The bounding box is returned as a 4-tuple defining the left, upper, right, and lower pixel coordinate.

If the image is completely empty, this method returns None.

from PIL import Image

with Image.open("shapes/box.png") as im:
    print(im.getbbox())
    # (26, 26, 230, 230)