A method for chroma key masking is provided. The method includes adjusting a first parameter representing a size of a first ellipsoid in a color space, adjusting a second parameter representing a size of a second ellipsoid in the color space, and generating a mask value for a given pixel color based on the location of the given pixel color in the color space, relative to the first and second ellipsoids. The first ellipsoid is centered about a prescribed chroma key color and the second ellipsoid is also centered about the prescribed chroma key color. The second ellipsoid surrounds the first ellipsoid in the color space.

 
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