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单词 Bluescreens
释义

Bluescreens

英语百科

Chroma key

Today's practicality of green-screen compositing is demonstrated by Iman Crosson in a self-produced YouTube video.Top panel: A frame of Crosson in full-motion video as shot in his own living room.Bottom panel: Frame in the final version, in which Crosson, impersonating Barack Obama,
Film set for The Spiderwick Chronicles, where a special effects scene using bluescreen chroma key is in preparation.
Virtual television studio with green-screen technique.
Girl wearing blue clothing in front of green screen.

Chroma key compositing, or chroma keying, is a special effects / post-production technique for compositing (layering) two images or video streams together based on color hues (chroma range). The technique has been used heavily in many fields to remove a background from the subject of a photo or video  particularly the newscasting, motion picture and videogame industries. A color range in the top layer is made transparent, revealing another image behind. The chroma keying technique is commonly used in video production and post-production. This technique is also referred to as color keying, colour-separation overlay (CSO; primarily by the BBC), or by various terms for specific color-related variants such as green screen, and blue screen  chroma keying can be done with backgrounds of any color that are uniform and distinct, but green and blue backgrounds are more commonly used because they differ most distinctly in hue from most human skin colors. No part of the subject being filmed or photographed may duplicate a color used in the background.

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