How to get information of images

[LI Ying <ying li enst-bretagne fr>]

Hello,

I want to write a libvncserver which can load diffrent kinds of images.
I need the information of images, so that I can tell the server how to
load it.
With the help of lib-pixbuf, I can get the information about the height
and width.
But I need to know other information like "bitsPerPixelInFile" and
"bytesPerPixel".
How can I do it?


Thanks