YUV is a method for defining colors. 4-2-2 and 4-1-1 are ways of reducing the file size of an image that are possible only in an YUV space (not quite true, but at least not possible in RGB). YUV is in reality mainly used for video. > I'm not following this thread but nice explanation. > So YUV in anything other than 4 4 4 is basically > "compressed video" ? Pär