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Lesson 9. Video/Audio > Video Fields

Video Fields

A review of the mechanics of video frames and fields is in order, so listen up. The resolution of video images is 525 lines for NTSC and 625 lines for PAL. NTSC video runs at 30 frames per second and PAL at 25 frames per second. Each video frame is made of two separate subframes called fields. Each of these fields is an individual snapshot in time. By using fields, the viewer sees twice as many frames and smoother motion. Even though the fields represent different points in time, they occupy the same video frame. This is achieved through a process called interlacing—the scourge of graphic artists and compositors everywhere.

The following pictures show two consecutive video frames with interlaced fields of a bee in motion. The more motion an image has, the more interlacing you will see.


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