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Home > Terms > English, UK (UE) > Anti-comet-tail (ACT)
Anti-comet-tail (ACT)
A complex technique of preventing picture highlights from “comet-tailing” due to lack of beam current in the camera tube.
(The usually coloured trail behind a moving, very bright light/reflection in a picture is called a “comet-tail” since the effect looks similar to an astronomical comet.) The technique involves a special tube and circuitry to drive it. Basically, the charge due to a very bright object is never allowed to build up to an unmanageable level by discharging the target above a preset level during horizontal retrace time when the ACT action is turned on, with an increased beam current.
- Part of Speech: noun
- Synonym(s):
- Blossary:
- Industry/Domain: Entertainment
- Category: Video
- Company: Tektronix
- Product:
- Acronym-Abbreviation:
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