png transparency with PIL

[Robin Becker]

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/pil/handbook/format-png.htm
> 
.......

that sounds like what I need.
-- 
Robin Becker