Letterbox
The technique of formatting a widescreen picture to fit within a non-widescreen frame. Letterboxed video refers to a 4:3 recording containing a 16:9 image that is reduced in size to fully fit within the narrower frame. Such reduced-size widescreen images fill the 4:3 frame horizonally, but not vertically. Black bars therefore appear above and below the image. This is the only technique of its kind to produce a full and undistorted representation of a widescreen image in an non-widescreen frame. Letterboxed images can be restored to widescreen by resizing, however, image resolution will be reduced with respect to the original widscreen image.
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