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Ethan, our ROCORI media student who made his debut with "The Battle between Socks & Shoes", is once again exploring the edge of videography. This week Ethan is experimenting with Bluescreen which he plans to incorporate into his next production.
(From Wikipedia, the free encyclopedia)
Bluescreen (also known as Chroma Key) is a term for the filmmaking technique of shooting foreground action against an evenly-lit monochomatic background for the purpose of removing the background from the scene and replacing it with a different image or scene. The term also refers to the visual effect resulting from this technique as well as the colored screen itself (although it is often not blue; for example, with greenscreen).
The key background color in the video signal is processed out and overlayed with content from a different video signal -- such as from a separate camera, a recorded video playback, or a digital source -- a process called "compositing". Both digital and analog techniques exist for doing this. The image replacement may be done in production or in post-production.
A classic example of the technique is the television news weatherman who on-screen appears to point at a map, but is in fact being recorded standing in front of a blank screen. On either sides of this screen are smaller televisions projecting a front view of the weather-caster, so they know where and when to place their hands. These early television effects were originally accomplished by a technique called chroma keying, but older analog methods have been increasingly supplanted by modern digital compositing techniques.
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