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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?
--
Robin Becker

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/pi...format-png.htm

Regards,


Björn

--
BOFH excuse #58:

high pressure system failure

Bjoern Schliessmann wrote:
> Robin Becker wrote:
>
>> I'm trying to determine the transparency information for a png
..........
>> 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/pi...format-png.htm
>
........

that sounds like what I need.
--
Robin Becker