python-imaging/Pillow — pull request #680 by hugovk (2014-05-30 08:17:31+00:00)
Title: Add tests for SPIDER image files

This found a bug for Python 3, a division needing an `int`, which has been fixed:

nvalues = int(labbyt / 4)
for i in range(nvalues):

The test image lena.spider was created with Pillow.

Also pep8/pyflakes cleanup.