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

Question

I need to convert series of images drawn as white on black background letters to images where white and black are inverted (as negative). How can I achieve this using PIL?

Answer 1

Try the following from the docs: http://effbot.org/imagingbook/imageops.htm

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."

Answer 2

If the image is RGBA transparent this will fail... This should work though:

from PIL import Image import PIL.ImageOps      image = Image.open('your_image.png') if image.mode == 'RGBA':     r,g,b,a = image.split()     rgb_image = Image.merge('RGB', (r,g,b))      inverted_image = PIL.ImageOps.invert(rgb_image)      r2,g2,b2 = inverted_image.split()      final_transparent_image = Image.merge('RGBA', (r2,g2,b2,a))      final_transparent_image.save('new_file.png')  else:     inverted_image = PIL.ImageOps.invert(image)     inverted_image.save('new_name.png')