title: Why do .png backgrounds appear black on iPhone device but not simulator?
body: <p>I started with a .tiff file and used GraphicConverter to change it to a .png and set a transparency color.  Worked fine in the simulator but when I pushed to the device the transparency color became black.  Tested with a .png I downloaded from the net and that worked fine, so it seems to only happen with some files.  Thus I suspect it has something to do with the way GraphicConverter writes the .pngs, but I don't know enough about file formats to debug it.  Any ideas/suggestions?  Ideally I'd like to programatically treat all .pngs because my app allowed dynamic loading of arbitrary files, so I can't verify the transparency beforehand.</p>