Chroma key Wikipedia. For the electronic music project, see Chroma Key. For musical tonality depending on key, see Key music. Todays practicality of green screen compositing is demonstrated by Iman Crosson in a self produced You. Windows Embedded Compact, formerly Windows Embedded CE and Windows CE, is an operating system subfamily developed by Microsoft as part of its Windows Embedded family. Issuu is a digital publishing platform that makes it simple to publish magazines, catalogs, newspapers, books, and more online. Easily share your publications and get. If youre flying anywhere for the Labor Day holiday, nows the time to book. Pretty Little Liar S05e09 Web here. Prices are only going to go up. Latest trending topics being covered on ZDNet including Reviews, Tech Industry, Security, Hardware, Apple, and Windows. Accurip and Spot Process Vuerite software by Freehand Graphics, plus screen printing film and ink for film positives. Now more than ever its important to be able to tell when youre reading FakeNews. However, determining whether something is fake or real isnt always easy. Tube 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, appears in the White Houses East Room. 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 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 foreground footage is made transparent, allowing separately filmed background footage or a static image to be inserted into the scene. 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 BBC2, 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 the color used as the backing. It is commonly used for weather forecastbroadcasts, wherein a news presenter is usually seen standing in front of a large CGI map during live television newscasts, though in actuality it is a large blue or green background. When using a blue screen, different weather maps are added on the parts of the image where the color is blue. If the news presenter wears blue clothes, his or her clothes will also be replaced with the background video. Chroma keying is also common in the entertainment industry for visual effects in movies and videogames. HistoryeditPredecessorseditPrior to the introduction of travelling mattes and optical printing, double exposure was used to introduce elements into a scene which were not present in the initial exposure. This was done using black draping where a green screen would be used today. George Albert Smith first used this approach in 1. In 1. 90. 3, The Great Train Robbery by Edwin S. Porter used double exposure to add background scenes to windows which were black when filmed on set, using a garbage matte to expose only the window areas. In order to have figures in one exposure actually move in front of a substituted background in the other, a travelling matte was needed, to occlude the correct portion of the background in each frame. In 1. 91. 8 Frank Williams patented a travelling matte technique, again based on using a black background. This was used in many films, such as The Invisible Man. In the 1. 92. 0s, Walt Disney used a white backdrop to include human actors with cartoon characters and backgrounds in his Alice Comedies. BluescreeneditThe blue screen method was developed in the 1. RKO Radio Pictures. At RKO, Linwood Dunn used an early version of the travelling matte to create wipes where there were transitions like a windshield wiper in films such as Flying Down to Rio 1. Credited to Larry Butler, a scene featuring a genie escaping from a bottle was the first use of a proper bluescreen process to create a traveling matte for The Thief of Bagdad 1. Academy Award for Best Special Effects that year. In 1. 95. 0, Warner Brothers employee and ex Kodak researcher Arthur Widmer began working on an ultraviolet travelling matte process. He also began developing bluescreen techniques one of the first films to use them was the 1. Ernest Hemingway novella, The Old Man and the Sea, starring Spencer Tracy. Petro Vlahos was awarded an Academy Award for his refinement of these techniques in 1. His technique exploits the fact that most objects in real world scenes have a color whose blue color component is similar in intensity to their green color component. Zbigniew Rybczyski also contributed to bluescreen technology. An optical printer with two projectors, a film camera and a beam splitter, was used to combine the actor in front of a blue screen together with the background footage, one frame at a time. In the early 1. 97. Html2pdf Php Library on this page. American and British television networks began using green backdrops instead of blue for their newscasts. Chroma key compositing, or chroma keying, is a visual effects postproduction technique for compositing layering two images or video streams together based on. During the 1. 98. For the film The Empire Strikes Back, Richard Edlund created a quad optical printer that accelerated the process considerably and saved money. He received a special Academy Award for his innovation. For decades, travelling matte shots had to be done locked down, so that neither the matted subject nor the background could shift their camera perspective at all. Later, computer timed, motion control cameras alleviated this problem, as both the foreground and background could be filmed with the same camera moves. Meteorologists on television often use a field monitor, to the side of the screen, to see where they are putting their hands against the background images. A newer technique is to project a faint image onto the screen. Some films make heavy use of chroma key to add backgrounds that are constructed entirely using computer generated imagery CGI. Performances from different takes can be composited together, which allows actors to be filmed separately and then placed together in the same scene. Chroma key allows performers to appear to be in any location without leaving the studio. The comedy show Tosh. Daniel Tosh standing directly on the purely green set. This is always done at the very end of the show. Computer development also made it easier to incorporate motion into composited shots, even when using handheld cameras. Reference points can be placed onto the colored background usually as a painted grid, Xs marked with tape, or equally spaced tennis balls attached to the wall. In post production, a computer can use the references to compute the cameras position and thus render an image that matches the perspective and movement of the foreground perfectly. Modern advances in software and computational power have eliminated the need to accurately place the markers the software figures out their position in space a disadvantage of this is that it requires a large camera movement, possibly encouraging modern film techniques where the camera is always in motion. ProcesseditThe principal subject is filmed or photographed against a background consisting of a single colour or a relatively narrow range of colours, usually blue or green because these colours are considered to be the furthest away from skin tone. The portions of the video which match the preselected color are replaced by the alternate background video. This process is commonly known as keying, keying out or simply a key. Processing a green backdropedit. Virtual television studio with green screen technique. The high amount of contrast between different parts of the screen is not ideal see even lighting. Green reflections from the desk would create undesirable artifacts. Green is used as a backdrop for TV and electronic cinematography more than any other colour because Superman and television weather men tended to wear blue suits. Separation Studio Spot Process Software TrialSeparation Studio Spot Process Software Free DownloadLatest Topics ZDNet. 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