Open a picture (anything but a bmp) in preview. save as. select "microsoft bmp". close it, open it, whatever you like. Looks great, doesn't it? Now try to get anything but quicktime to render it. (send it to a windows box for example)
Bust out a hex editor for a surprise. It's saving the height as a negative number. A picture 160 pixels high is saved as -160 pixels high. Quickdraw apparently doesn't mind, but other stuff (like my arduino...) certainly notices the difference.
