[Image-SIG] Serious bug in PIL's handling of PNG images

[Ivan Tkatchev]

Please see the relevant discussion and patch here:

http://stackoverflow.com/questions/4217869/python-pil-all-areas-of-png-with-opacity-0-have-their-opacity-set-to-1

This is a very serious bug that affects many upstream packages.

It would be nice if a fix made its way into the official PIL release so that
users would not have to suffer.

Thank you.
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