Quote Originally Posted by scarleton View Post
My bad, I ment bytes, not bits. I think it is Windows native image format that does this.
Native Windows format is BMP which is vertically mirrored BGR 8b or 24b without any padding, as far as I remember.

I am guessing it is because 32-bit OS's work the quickest in 4 byte chuncks, though it is a pain to save out
Honestly I never heard of such padding, it would be a pure waste of memory space. Padding usually occurs only at the end of some data, not in the middle of it. Of course I don't deny such formats may exist, I just never had any experience with those Image formats tend to have multiple of word length as their bit per gun anyway. Of course the word length might be different for different architectures.