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The Materiality Of Video
Bernhard Frankel
The Materiality of Video
Good old fashioned TV has an aspect ratio of 3:4.

That means if an image is four units wide it should be three units high. If a unit represents 10 pixels, an image should be 40 x 30 pixels. As television is defined as having 576 active lines we can calculate what the width of the images should be in pixels:

576 divided by 3 = 192 (each unit is 192 pixels)
192 multiplied by 4 = 768

The definition for an image taken from video on a computer should be 576 x768 pixels. The 702 active pixels needs to be elongated (unsquished) to taking up the space of 768 pixels. Or, to put it more simply, the whole image (all 720 pixels) needs to fill the space of 788 pixels.

Examples before and after aspect ratio correction.
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