[pygame] Pygame and .png?

[Jasper Phillips <jasper@peak.org>]

When I save .pngs with pygame.image.save(), I can't open them in gimp, nor can
I pygame.image.load() them.  However, I can load .png's created elsewhere
just fine.

Is this a bug, or is there some trick I'm missing?  Anyone else have this
problem?  It's easy to work around with PIL, or just changing format in
Gimp, but it's been bugging me for a long time (as otherwise I have no
dependency upon PIL).

-Jasper