Two pieces of info (not necessarily useful).
1) iOS uses .PNG for screenshots (at least in some versions, but I found no evidence this changed)
2) the .PNG format used is non-standard (i.e. it uses a "pngcrush" for compressing it).
See:
http://www.question-defense.com/2009/10/04/open-png-image-files-from-iphone-or-ipod-touch-on-windows
In your tests are you taking the screenshot with the Home pressed button+push of sleep/wake as in here?
http://getsetgames.com/2009/07/30/5-ways-to-take-screenshots-of-your-iphone-app/
or in some other way?
jaclaz
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