Install Pillow on Raspbian

apt-get install python-pip
sudo pip install Pillow

https://pillow.readthedocs.org/
Pillow — Pillow v2.7.0 (PIL fork)
Pillow is the ‘friendly’ PIL fork by Alex Clark and Contributors. PIL is the Python Imaging Library by Fredrik Lundh and Contributors. To install Pillow, please follow the installation instructions. To download source and/or contribute to development of Pillow please see: https://github.com/python-pillow/Pillow. c Copyright 1997-2011 by Secret Labs AB, 1995-2011 by Fredrik Lundh, 2010-2013