png transparency with PIL

Robin Becker robin at
Fri Nov 23 19:14:26 CET 2007

I'm trying to determine the transparency information for a png image. With gif 
images I can determine the colour that is used for transparent areas using['transparency']. For the png images of interest there is no such entry 
in the info dict. I assume that's because of the way png does transparency. I'm 
guessing I need the alpha channel, but is there a way to get hold of it?
Robin Becker

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