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All About Aspect Ratios

An aspect ratio is a mathematical expression for the shape of an image.
Standard televisions have an aspect ratio of 1.33:1 (sometimes expressed as 4 x 3),
meaning a TV image is one and one-third times as wide as it is high. Most theater
screen images are wider than those of television screens, with the two most common
theatrical ratios being 1.85:1 and 2.35:1. Other ratios sometimes used are 1.66:1
(standard European format), 1.75:1, 2:1, 2.20:1, 2.55:1 and 2.75:1.
Prior to the introduction of widescreen presentations (circa 1953), the theatrical ratio used
was 1.33:1, the same as standard TV.

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