Since PIL is dead for the most part. Instead, install the pillow plug, sudo pip install pillow and use the ImageEnhance module http://pillow.readthedocs.org/en/3.0.x/reference/ImageEnhance.html
>>> from PIL import Image, ImageEnhance >>> image = Image.open('downloads/jcfeb2011.jpg') >>> contrast = ImageEnhance.Contrast(image) >>> image.show()

>>> contrast.enhance(2).show()

source share