Pixel Short for Picture Element. The basic unit from which a video or computer picture is made. Essentially a dot with a given color and brightness value. D1 images are 720 pixels wide by 486 high. NTSC images are 640 by 480 pixels.
Computer monitors use progressive scan.
Some of the new HDTV standards call for progressive scan. The amount of detail in an image. Higher resolution equals more detail. Also used to describe the size of an image, usually in pixels. Resolution Independent A term to describe equipment that can work in more than resolution.