TIFF plugin issue

Hi all,

While trying to operate on a multi-image TIFF using PIL, on a sub-image with this identification (from ImageMagick identify):

TIFF 1280x1024 1280x1024+0+0 1-bit Bilevel DirectClass 18.97MB 0.010u 0:00.000

I get an "unknown pixel mode" error.  It seems that this sub-image translates to an OPEN_INFO key of:

(II, 1, 1, 1, (1,1), (2,))

...and there exists no corresponding value for such a key in the TiffImagePlugin.py module.  

I've found that if I add the attached patch it seems to work fine for my case.  Does this look correct?  If so, please add it in.

Thanks in advance,
Dale

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