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.
See Crystal Vision at IBC2003 in Stand 2.201 or visit: www.crystalvision.tv.
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