Does a mono sound take more space than a stereo sound file? Yeah, half. Provided you don't store a mono sound in a stereo audiofile. Same thing for grayscale

Does a mono sound take more space than a stereo sound file? Yeah, half. Provided you don't store a mono sound in a stereo audiofile. Same thing for grayscale images. If your white is a #FFFFFF instead of a #FF your picture is a color file that coincidentally displays a grayscale image.