The pillarbox effect occurs in widescreen video displays when black bars (mattes or masking) are placed on the sides of the image. It becomes necessary when film or video that was not originally designed for widescreen is shown on a widescreen display, or a narrower widescreen image is displayed within a wider aspect ratio, such as a 1.85:1 image ...
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http://en.wikipedia.org/wiki/Pillarbox
The effect of displaying a traditional (4:3 aspect ratio) image on a widescreen (16:9) monitor. In o
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https://www.encyclo.co.uk/local/22375
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