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Letterbox: A video effect used to preserve aspect ratio when video, originally captured in widescreen format, is presented on a standard-width display. The result is a video signal that has black bars above and below the video to compensate eliminating the need to stretch and therefore distort the video.  As televisions, computers and monitors are moving away from standard-width video delivery, this is becoming less necessary and therefore less common. [ Video Glossary ]

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