5. ImageOps expand

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

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5.1. Expand

Use the ImageOps.expand(image, border=0, fill=0) method to return an image that has a border added to it.

border - Border width, in pixels.

fill - Pixel fill value (a color value). Default is 0 (black).

from PIL import Image, ImageOps

with Image.open("test_images/shapes.png") as im:
    im1 = ImageOps.expand(im, border=25, fill="red")
    im1.save("imageOps/expand.png")