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Using Chromakey effects

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The Chroma Key node removes a key color from the input image by making it transparent, and other nearby colors by making them partially transparent - giving an anti-aliased edge to the removed regions.

The node's XSheet columns set the key color, the range of nearby colors that are affected, and what proportion of those colors are entirely transparent:

• The Color column sets the key color.

• The Tolerance sets the range of nearby colors that are affected, as a fraction of the color space. If the difference between a color and the key color is less that the Tolerance, its transparency is changed.

• The Threshold sets the fraction of the Tolerance within which colors become entirely transparent. Other colors within the Tolerance gradually become less transparent the more they differ from the key color - forming an anti-aliased edge.

For example:

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Animo NT User's Guide - Version 2.0 - 29 Jan 1999 Copyright © Cambridge Animation Systems