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Effects and transitions
Last updated 11/30/2015
Interlacing and field order
Interlaced video, noninterlaced video, and progressive scanning
A For interlaced video, entire upper field (odd-numbered lines) is drawn to screen first, from top to bottom, in one pass. B Next, entire lower field
(even-numbered lines) is drawn to screen, from top to bottom, in one pass. C
For noninterlaced video, entire frame (all lines in counting order)
is drawn to screen, from top to bottom, in one pass.
Interlacing is a technique developed for transmitting television signals using limited bandwidth. In an interlaced
system, only half the number of horizontal lines for each frame of video are transmitted at a time. Because of the speed
of transmission, the afterglow of displays, and the persistence of vision, the viewer perceives each frame in full
resolution. All of the analog television standards use interlacing. Digital television standards include both interlaced
and noninterlaced varieties. Typically, interlaced signals are generated from interlaced scanning, whereas noninterlaced
signals are generated from progressive scanning.
Chris Pirazzi provides technical details of fields and interlacing on Lurker's Guide to Video website.
Trish and Chris Meyer provide various materials about interlacing, field order, field dominance, field rendering, and
separating fields:
article (PDF) introducing interlacing and field separation on the Artbeats website
article introducing interlacing and field order on the ProVideo Coalition website
article clarifying meanings of the terms field order and field dominance on the ProVideo Coalition website
For information about exporting a PsF (progressive segmented frame) video file from Premiere Pro via Adobe
Media Encoder,
see this thread on the Premiere Pro user-to-user forum.
More about PsF video.
About field dominance and field reversal
Fields in a clip can become reversed from the state in which they were originally acquired in any of the following ways:
The video capture card used to capture the footage is set to the field dominance opposite that of the source device,
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