Is there anywhere I can read about the byte arrangements for GIFS?

So for example, there's a site that tells me what the byte arrangements are 开发者_开发百科for GIFs, for example, the first 7 bytes are the HEADER, next 6 bytes are description information etc etc?

I am looking for both static and animated GIF images.

Bonus points if you can supply a site that covers other images.

It's so I know how to correctly interpret the files.

Search in the wiki a http://en.wikipedia.org/wiki/Graphics_Interchange_Format got a link.