Besides subsampling that occurs during broadcast, many professional video recording formats do not deliver full horizontal resolution as well. For example, frame size of 1080-line HDCAM format is 1440x1080, frame size of 1080-line DVCPRO HD format is either 1440x1080 or 1280x1080 depending on scanning rate, frame size of 720-line DVCPRO HD format is 960x720. Horizontal downsampling is used in preference to vertical downsampling because vertical downsampling would break any interlacing, and also because Cathode Ray Tube (CRT) displays (which were still common when the HD formats were standardised) scan horizontal rows continuously, but vertical lines discretely, making changes to vertical resolution more visible on such displays. The situation has begun to change with launch of newer video recording formats that use full 1920x1080 raster, like XDCAM HD422 or AVC-Intra.