what is the difference between bisizeimage , bisize and bfsize?

@Roman Abashin’s answer has a slight but important error. biSize is not the combined size of both headers. biSize is the size of the BITMAPINFOHEADER only. It is 40 bytes. The combined size of both headers is actually bfOffBits (you can think of the “Off” as referring to the offset of the actual bitmap from the beginning … Read more