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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 color 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 ...
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. Pre- digital compositing techniques, however, go back as far as the trick films of Georges Méliès in the late 19th century, and some are still in use.
Blue screen, Blue Screen or bluescreen may refer to: Chroma key or blue-screen compositing, a technique for combining two still images or video frames;
Compositing techniques known as chroma keying that remove all areas of a certain color from a recording—colloquially known as "bluescreen" or "greenscreen" after the most popular colors used—are probably the best-known and most widely used modern techniques for creating traveling mattes, although rotoscoping and multiple motion control ...
The current version is the fourth generation of the Primatte technology and has features such as ‘Auto-Compute’ that automatically detects the backing screen color, eliminates it and does clean-up on the foreground and backing screen area noise. It is available on the Microsoft Windows, Red Hat Linux, SGI IRIX and the Apple Macintosh platforms.
The technology used today as a way of combining actors with background footage still derives from the techniques he developed. Vlahos was not the first to use the blue-screen technology — it was invented by Larry Butler for the 1940 filming of The Thief of Bagdad — but he made the process much more realistic and scientific.
Live-action shoots for compositing is variously called "chroma key", "blue screen", "green screen" and other names. Today, most, though not all, compositing is achieved through digital image manipulation.
Rotoscoping generally provides a higher level of accuracy and may be used in conjunction with Chroma-keying. It may also be used if the subject is not in front of a green (or blue) screen, or for practical or economic reasons.