Chroma key compositing is a film and video post-production technique in which a subject is filmed in front of a background of a single, distinct color, most commonly a specific shade of green or blue, which is then digitally or optically removed and replaced with different background footage, letting a performer or object appear placed within a scene never actually filmed together. Developed from earlier optical traveling-matte processes used in film through the mid-twentieth century and standardized as a video technique from the 1970s onward, chroma key compositing, popularly called "green screen" or "blue screen," is now a routine tool in film, television, news broadcasting, and video production for combining live footage with separately generated backgrounds or visual effects.
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Film, Art Forms chroma key compositing is a technique of the film art form.
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Wikimedia FoundationChroma Key Compositing, Wikipedia summary leadQuote, Chroma Key Compositing, Wikipedia summary lead
Chroma key compositing, or chroma keying, is a visual-effects and post-production technique for compositing (layering) two or more images or video streams together based on colour hues. The technique has been used in many fields to remove a background from the subject of a photo or video, particularly the newscasting, motion picture, and video game industries.
Frequently Asked Questions
Why is chroma key compositing also called green screen or blue screen?
Chroma key compositing films a subject in front of a background of a single, distinct color, most commonly a specific shade of green or blue, which is then digitally or optically removed and replaced with different background footage. That background color is what gives the technique its popular names, green screen and blue screen. It grew out of earlier optical traveling-matte processes used in film through the mid-twentieth century and was standardized as a video technique from the 1970s onward.
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