python-pillow/Pillow — pull request #938 by hugovk (2014-10-02 08:05:52+00:00)
Title: Support for 4-bit greyscale TIFF images

* Test Hopper image created with ImageMagick: `convert tests\images\hopper.jpg -colorspace Gray -colors 16 -depth 4 tests\images\hopper_gray_4bpp.tif`
* Add `(II, 1, 1, 1, (4,), ()): ("L", "L;4")` to TiffImagePlugin.py's `OPEN_INFO` dict to support it.
* With test case that compares image is similar to an original.
* flake8.
* Replaces #933.
* Closes #932.