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What is Chroma key?
Chroma key compositing, or chroma keying, is a visual effects / post-production technique for compositing (layering) two images or video streams together based on color hues (chroma range). The technique has used 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 foreground footage made transparent, allowing filmed background footage or a static image to inserted into the scene. The chroma keying technique used in video production and post-production. This technique also referred to as color keying, colour-separation overlay (CSO; by the BBC), or by various terms for specific color-related variants such as green screen, and blue screen – chroma keying can done with backgrounds of any color that are uniform and distinct, but green and blue backgrounds more used because they differ most in hue from most human skin colors. No part of the subject filmed or photographed may duplicate the color used as the backing.
It used for weather forecast broadcasts. Wherein a news presenter usually seen standing in front of a large CGI map during live television newscasts, though in actuality it a large blue or green background. When using a blue screen, different weather maps added on the parts of the image where the color blue. If the news presenter wears blue clothes, his or her clothes will also replaced with the background video. Chroma keying also common in the entertainment industry for visual effects in movies and videogames.