6. ImageFilter UnsharpMask

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

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6.1. UnsharpMask

Use the Image.filter(ImageFilter.UnsharpMask(radius=2, percent=150, threshold=3)) method to sharpen an image.

radius - Blur Radius

percent - Unsharp strength, in percent

threshold - Threshold controls the minimum brightness change that will be sharpened

from PIL import Image, ImageFilter

with Image.open("test_images/alph_blocks.png") as im:
    new_im = im.filter(ImageFilter.UnsharpMask(radius=1, percent=200, threshold=3))
    new_im.save("filters/UnsharpMask1.png")
    new_im = im.filter(ImageFilter.UnsharpMask(radius=2, percent=150, threshold=3))
    new_im.save("filters/UnsharpMask2.png")