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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.
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but, If you are new to animation industry then read first
Let us explain you brief about what RotoScoping is?
Rotoscoping is an animation technique used by animators to trace over motion picture footage, frame by frame, when realistic action required. Originally, photographed live-action movie images projected onto a glass panel and re-drawn by an animator. This projection equipment referred to as a rotoscope, developed by Polish-American animator Max Fleischer. Although this device was eventually replaced by computers, the process is still referred to as rotoscoping.
In the visual effects industry, rotoscoping is the technique of manually creating a matte for an element on a live-action plate so it may be composited over another background.
A horse’s gallop traced, from a series of photographs by Eadweard Muybridge.
Rotoscoped frames of Eadweard Muybridge’s Horse in Motion engraved into twenty metal discs. The metal plates photographed after they engraved and then edited into sequence.
‘Rotoscoping’ has often used as a tool for visual effects in live-action movies. By tracing an object, the moviemaker creates a silhouette (called a matte) that can used to extract that object from a scene for use on a different background. While blue and green screen techniques have made the process of layering subjects in scenes easier, rotoscoping still plays a large role in the production of visual effects imagery. Rotoscoping in the digital domain is often aided by motion tracking and onion-skinningsoftware. Rotoscoping is often used in the preparation of garbage mattes for other matte-pulling processes.
One classic use of traditional rotoscoping in the original three Star Wars movies, where it used to create the glowing lightsaber effect, by creating a matte based on sticks held by the actors. Rotoscoping has also used to allow a special visual effect (such as a glow, for example) to guided by the matte or rotoscoped line. To achieve this, effects technicians traced a line over each frame with the prop, then enlarged each line and added the glow.