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Various aspect ratios
Aspect ratio describes the proportions of a still image or the frames in a movie, expressed as the ratio of width to height. For example, pre-1950s movies and 35 mm slides have an aspect ratio of 4:3.
Aspect ratio is usually expressed either as a ratio of width over height (for example, 4:3) or as a real value relative to 1 (for example, 1.333).
Aspect ratios are used anywhere a bitmap is created or used. For example:
When preparing to render, you can specify an aspect ratio for your rendered images with the Image Aspect parameter on the Render Scene.
When setting up a viewport background, you can specify whether to use the viewport, bitmap or rendering output aspect ratio to display the bitmap.
When you make a spotlight a projector, you can use the Bitmap Fit option to match the spotlight's aspect ratio to the bitmap's, and thus prevent the bitmap from distorting.
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