The Chroma Key process is based on the Luminance key. In a luminance key, everything in the image over (or under) a set brightness level is "keyed"out and replaced by either another image, or a color from a color generator. Also known as Blue Screen Compositing, the Chroma Key Process was made famous by films such as star wars where spacecraft miniatures were composited onto starfield backgrounds.
A rule for combining two video signals, or two images, based on the color of one image, such as: The output signal/image is taken from signal/image A, except where A contains the chroma key value, where the output is taken from signal/image B, allowing signal/image A and B to be overlayed, with A's chroma key pixels effectively transparent.
A television effect that uses a monochromatic colored background to allow electronic switching to another picture. Deep blue and deep green are commonly used for this purpose when the image involves humans.
A keying affect that uses color (usually blue or green) to indicate selected screen areas. All keyed areas are replaced by other video (like Computer Generated Imagery , Still images of backgrounds, Virtual Sets or other video).
The process of controlling the replacement of part of a video image with a second image. The control signal is developed from characteristics of the chrominance of a video signal.
A process by which a specific color (usually green or blue) in a piece of video is replaced by another source. Weathercasters stand in front of a "chroma key blue" wall, on which a weather map is electronically superimposed.
A special key function that will render a specific color in a layer transparent. For example, if you shoot someone in front of an evenly-lit blue screen, you can use a chroma key function to render the blue completely transparent, thus revealing underlying video layers.
A type of key where the hole-cutting information is derived from a color rather than from a video level. A common example of chroma key is when the weather caster appears to be standing in front of a map. The map is an electronic signal, and the weather caster is actually standing in front of a solid blue or green screen. The chroma key process electronically subtracts the color from the foreground image, and replaces it with video from the background image to form a composite image.
(color key). A video key effect in which one video signal is inserted in place of areas of a particular color in another video signal.
Process of overlaying one video signal over another by replacing a range of colors with the second signal.
Chroma key is an effect in video programs which allows you to remove a specified color from a video clip so that other video can be inserted in the deleted area.
The process of using a video signal's color characteristics to do the "cutting" of a foreground image into a background image. Allows the weatherman to appear to stand in front of a satellite image.
The process of shooting against a coloured background [normally green or blue], which is removed electronically in post production to allow the foreground to be placed over any background.
A video effect that replaces a (background) color (usually blue or green) with another video source. It is most commonly used for weather reporting. The weatherman stands in front of a blue or green screen, then that color is replaced with a video picture of a weather map. Chroma Key is commonly called the weatherman effect.
Indication of the level of intensity and saturation of a hue. A high chroma key is bright and pure. A low chroma key is dull and murky.
A chroma key is the removal of a color (or small color range) from one to reveal another image 'behind' it. The removed color becomes transparent. This technique is also referred to as "color keying", "colour-separation overlay" ("CSO") (primarily by the BBC), "greenscreen" and "bluescreen".