A 24-bit PNG would have no transparency, being 3 8-bit channels for RGB. Alpha transparency is a channel too! To be fair, the PNG spec is really bad about refe

A 24-bit PNG would have no transparency, being 3 8-bit channels for RGB. Alpha transparency is a channel too! To be fair, the PNG spec is really bad about referring to alpha as if it were something entirely different from a color sample. I have spent way too much time thinking about PNG minutiae for a project at work...