Main Page | See live article | Alphabetical index Colour Separation Overlay is the collective technical term for what is commonly called Chroma Keying. A film or television graphical effect for compositing two full frame images together, by discriminating the visual information into values of color and light. A particular colour is isolated by the system, used as a template or matte and then replaced with an alternate image or video. Most often used by weather presenters, virtual studios and special effects technicians. See also: Chroma key, luma key, matte key, bluescreen, composite video, chrominance signal, Federal Standard 1037C This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.