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Sometimes a shadow can be used to create a visual effect. Areas of the blue screen or green screen with a shadow on them can be replaced with a darker version of the desired background video image, making it look like the person is casting a shadow on them. Any spill of the chroma key colour will make the result look unnatural.
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.
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.
The two chroma components are sampled at half the horizontal sample rate of luma: the horizontal chroma resolution is halved. This reduces the bandwidth of an uncompressed video signal by one-third, which means for 8 bit per component without alpha (24 bit per pixel) only 16 bits are enough, as in NV16.
Green screen compositing, or more generally chroma key compositing, is a technique for combining two still images or video frames. Green screen may also refer to: Green-screen display, a monochrome CRT computer display; GreenScreen Interactive Software, a publisher of video games
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-skinning software.
This page was last edited on 2 June 2009, at 01:07 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply ...
Advanced features include motion tracking, comprehensive color correction with tools like LUT Editor and RGB Curves, and a mask tool for selective filter application. Additional capabilities include multicam editing, chroma keying for green screens, and various video effects like filters, transformations, OpenGL effects, and transitions.
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