areas not available in action-safe areas. (MPEG-2 is a bad example, since it has many ties to analogue broadcasting, and employs only a few set sizes; this is why it will always capture nominal analogue blanking in addition to the active picture next to it.) Since there are such a wide variety of television screens that may display pictures slightly differently, programs produced in 4:3 aspect ratio are transmitted with picture information in the yellow and red areas to ensure the picture takes up the entire screen with no black area around the edges. Widescreen programs in 14:9 or 16:9 aspect ratio, on the other hand, are produced with zero overscan at the top and bottom of the picture, where the letterbox bars appear on a 4:3 television. References Television terminology Television technology