8. ImageFilter Contour

See: https://pillow.readthedocs.io/en/stable/reference/ImageFilter.html#filters

8.1. Contour

Use the ``Image.filter(ImageFilter.CONTOUR)``method to contour an image.

from PIL import Image, ImageFilter

with Image.open("test_images/alph_blocks.png") as im:
    new_im = im.filter(ImageFilter.CONTOUR)
    new_im.save("filters/contour.png")