4. ImageOps grayscale

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

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4.1. Grayscale

Use the ImageOps.grayscale(image) method to convert an image to grayscale

from PIL import Image, ImageOps

with Image.open("test_images/cliffs.jpg") as im:
    im1 = ImageOps.grayscale(im1)
    im1.save("imageOps/grayscale.png")