Can someone provide me a specification of 32 bit BMP image format?

Question

My application have some problem on opening 32bit BMP images. some image has alpha channel and with certain value, but window image viewer, picasa photoshop seems ignore the alpha channel. how can I know whether I should take the alpha channel into account.

So I need a specification of 32bit BMP Image. Can anyone help?

Many thanks!

Answer 1

The ultimate documentation for the BMP format comes from the authors of it - Microsoft. Read it at MSDN.

Answer 2

http://www.wotsit.org/ has the answer:

(Warning for popups when visiting following link)
http://www.fortunecity.com/skyscraper/windows/364/bmpffrmt.html

Answer 3

Also in Wikipedia: BMP