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Crystal Vision releases Key Shrink for Safire digital chroma keyer
Aug 28, 2003 12:00 PM
Crystal Vision has added Key Shrink to its Safire digital chroma
keyer, removing the dark band that sometimes appears around foreground
objects.
The realism of a chroma key is largely determined by how the keyer
handles the boundary surrounding the foreground image. As a result of
the processing involved in extracting a key signal from the foreground
chrominance, there is an inherent tendency for the key to spread,
leaving a dark line at the edges of non-keyed foreground objects.
Key Shrink corrects this problem by allowing a user to move the
edges of the key signal by a fraction of a pixel to eliminate the dark
band around foreground objects. Key Shrink works in both additive and
multiplicative keying.
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