Aspect ratio

The width-to-height ratio of an image. Specifically in film, the format that the film image is intended to be shown in, most commonly expressed as width relative to height, where the height parameter has been scaled to represent 1 unit. Standard TV screens are 1.33:1, films shown in U.S. theatres are 1.85:1, anamorphic films are 2.4:1. Ratios may also be expressed as integers, e.g., the TV ratio may be expressed as 4×3, and widescreen TVs are 16×9, or an aspect ratio of 1.78:1.

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