[pygame] pygame.image.save()

[Ian Mallett]

Hi,
  On my project, http://www.pygame.org/project/698/?release_id=1226, there
is a render option, which allows you to render an image of an arbitrary size
using the coordinates on the viewport.  The image is then saved.
Unfortunately, for some people this works, and for others, it returns an
invalid .png file.  I'm guessing it has something to do with the surface
type (e.g. 16 bit, 32 bit, etc.).  I'm not sure though.  Ideas?
Thanks,
Ian