Format of .png images?

Newbie & Debugging Questions
#1

What’s the internal format of .png? RGBA? Other? I’ve looked in the books I have, and on the web and can’t seem to find a definate answer.

Thanks,

Zahl

#2

It isn’t hard to find…

google PNG
http://www.libpng.org/pub/png/png-sitemap.html#info

navigate to the latest spec
http://www.w3.org/TR/2003/REC-PNG-20031110/

Look up the colour stuff for answers to your specific RGBA? question
http://www.w3.org/TR/2003/REC-PNG-20031110/#6Colour-values

Note that colour profiles and gamma correction are also part of the standard.

#3

A nice resource to find out about almost any file format:

http://www.wotsit.org/

shmoove