How do I use the 'Matte' effect?The Matte effect allows for the masking out of a region, of each source image frame, based on its color, and for the replacing of it, with a background picture or pattern. The way this works, is that a specific color is chosen to be keyed. Each pixel in the source image is compared against the keyed color. If a pixel’s color is sufficiently close to the keyed color, the corresponding pixel in a specified picture or pattern is used, to replace the original pixel in the output image. An object will typically be photographed against a blue, red or green background so that an entirely different scene may be masked in as a background. This is commonly referred to as a chroma-key or blue- screen effect.
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