The anamorphic horizontal compression system used in the cinema industry, optically compresses the wide-screen movie frames by a special lens, to fit on a standard film (35mm or similar). When displayed on the screen, the opposite effect is used – stretching the frames to the original wide-screen format. In the DVD format, a similar process takes place, where the frames are digitally compressed horizontally on the disc. When played on a standard, 4:3 aspect TV, a letterbox image is shown, but when set to 16:9, a full wide-screen image is shown on a Plasma screen or video projector which is capable of 16:9 image reproduction.
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