png transparency with PIL

[Bjoern Schliessmann]

Robin Becker wrote:

> 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 im.info['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?

For accessing the alpha channel, there is an RGBA mode for PNG
files:

http://www.pythonware.com/library/pil/handbook/format-png.htm

Regards,


Björn

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