python-imaging/Pillow — pull request #364 by wiredfool (2013-10-04 20:39:16+00:00)
Title: Alpha Premultiplication support for transform and resize

Fixes #66, including (jorgebastida/glue#76)

I've tested on the real world image from http://stackoverflow.com/questions/13027169/scale-images-with-pil-preserving-transparency-and-color .

The tests are done with a synthetic image that's designed to be easy to verify correctness. Please test and let me know.