A decreasing of the raster size (H and V) so that all four edges of the picture are visible on the screen. Underscanning allows viewing of skew and tracking that would not be visible in normal (overscanned) mode. It is also helpful when aligning test charts to be certain they touch all four corners of the raster. Likewise, when checking the alignment of multiplexer images from a film chain, underscan allows proper framing of the projected image going into the video camera.
Decreases raster size H and V so that all four edges of the picture are visible on the monitor.
Video monitor that can reduce the size of the video image so the four outer frame edges can be viewed in their entirety.
Video display scanning technique in which the entire video signal, including black parameter retrace portions, is displayed on the CRT.
unlike televisions, computer monitors are normally set to underscan the picture they receive. This means they show the entire picture on the screen, even if it means black borders can be seen around the edge.
To scan a television screen so that the edges of the raster are visible. See also overscan.
reducing height and width of the picture on a video monitor so that the edges, and thus portions of the blanking, can be observed .
See Overscan vs. Underscan.
Mode of operation for broadcast monitors, where the entire picture area, including that normally cropped by domestic television sets, can be displayed.