[Image-SIG] No "transparency" key in info for transparent PNG

[Fredrik Lundh]

Szymon Kosok wrote:

> I have transparent PNG (when I open it in Photoshop it's transparent)
> and when I try to open it with PIL there is no "transparency" key in
> info. I've tried another transparent PNG (famfamfam icon) and no luck
> with that too. What can cause that problem? Mode is "RGBA".

the transparency key is used to mark a given color index as transparent 
for 8-bit (mode "P") images.  an RGBA image has a transparency value for 
each pixel (that's what the "A" in the mode name stands for).

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