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Chroma key

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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 (chroma range). 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.

CompositingCompositingCompositing is the process or technique of combining visual elements from separate sources into single images, often to create the illusion that all those elements are parts of the same scene. Live-action shooting for compositing is variously called "chroma key", "blue screen", "green screen" and other names. Today, most compositing is achieved through digital image manipulation.Video gameVideo gameElectronic game with user interface and visual feedback"Computer game" redirects here. For games played on personal computers, see PC game.ImageImageAn image or picture is a visual representation. An image can be two-dimensional, such as a drawing, painting, or photograph, or three-dimensional, such as a carving or sculpture. Images may be displayed through other media, including a projection on a surface, activation of electronic signals, or digital displays; they can also be reproduced through mechanical means, such as photography, printmaking, or photocopying.VideoVideoVideo is an electronic medium used for the recording, copying, playback, transmission, and display of moving visual images and pictures, with or without accompanying audio. Video technology was initially developed for live transmission and later expanded to include recording and storage through analog formats such as magnetic tape.Visual effectsVisual effectsVisual effects (sometimes abbreviated as VFX) is the process by which imagery is created or manipulated outside the context of a live-action shot in filmmaking and video production. The integration of live-action footage and other live-action footage or computer-generated imagery (CGI) elements to create realistic imagery is called VFX.Video productionVideo production is the process of producing video content. It is the equivalent of filmmaking, but with video recorded either as analog signals on videotape, digitally in video tape or as computer files stored on optical discs, hard drives, SSDs, magnetic tape or memory cards instead of film stock. There are three main stages of video production, pre-production, production and post-production.Foreground detectionForeground detectionForeground detection is one of the major tasks in the field of computer vision and image processing whose aim is to detect changes in image sequences. Background subtraction is any technique which allows an image's foreground to be extracted for further processing (object recognition etc.).ColorfulnessColorfulnessColorfulness, chroma and saturation are attributes of perceived color relating to chromatic intensity. As defined formally by the International Commission on Illumination (CIE) they respectively describe three different aspects of chromatic intensity, but the terms are often used loosely and interchangeably in contexts where these aspects are not clearly distinguished. The precise meanings of the terms vary by what other functions they are dependent on.Post-productionPost-productionPost-production, also known simply as post, is part of the process of filmmaking, video production, audio production, and photography. Post-production includes all stages of production occurring after principal photography or recording individual program segments. Contrary to the name, however, post-production may occur at any point during the recording and production process.BBCBBCBritish public service broadcaster"The Beeb" redirects here. For other uses, see Beeb.The British Broadcasting Corporation (BBC) is a British public service broadcaster headquartered at Broadcasting House in London, England. Originally established in 1922 as the British Broadcasting Company, it evolved into its current state with its current name on 1 January 1927.Broadcast journalismBroadcast journalismTV newsreporter in Hong Kong (2007).Broadcast journalism is the field of news and journals which are broadcast by electronic methods instead of the older methods, such as printed newspapers and posters. It works on radio (via air, cable, and Internet), television (via air, cable, and Internet) and the World Wide Web. Such media disperse pictures (static and moving), visual text and sounds. HistoryPre-1945Silent news films were shown in cinemas from the late 19th century.FilmFilmVisual art consisting of moving imagesA Trip to the Moon (1902) is considered to be a turning point in the development of narrative and science fiction films.A film, movie, or motion picture is a work of visual art that simulates experiences and otherwise communicates ideas, stories, perceptions, emotions, or atmosphere through the use of moving images that are generally, since the 1930s, synchronized with sound and sometimes feature other sensory stimuli.

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