How to invert colors of image with PIL (Python-Imaging)?

Try the following from the docs: https://pillow.readthedocs.io/en/stable/reference/ImageOps.html

from PIL import Image
import PIL.ImageOps    

image = Image.open('your_image.png')

inverted_image = PIL.ImageOps.invert(image)

inverted_image.save('new_name.png')

Note: “The ImageOps module contains a number of ‘ready-made’ image processing operations. This module is somewhat experimental, and most operators only work on L and RGB images.”