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Interlace issues

Interlace issues

A computer monitor draws its pixels hori-zontally across the screen one line at a time, from top to bottom. This is called progressive scanning. Video works differ-ently. It draws every other horizontal line on its way down and then goes back to the top and fills in the lines in between. Each half-image is called a field, and fields are drawn at 59.94 per second for NTSC video—double the speed of the well-known NTSC 29.97 frame rate. Combining the fields is called interlacing. The most important point to remember about interlacing is that one frame contains pixels from two different instances of time, and that you don't want to get the time order wrong.

For more information on interlacing, see the After Effects User Guide.


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