Grass Valley 1200 Operation Manual - Manual (Page 177)

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Chroma Keying
Chroma Keying
Chroma keying allows you to key out a particular color in a scene
and replace it with new background video. A typical application
is to position a reporter in front of a blue wall and set up a chroma
key to replace the blue wall with a weather map (Figure 4-6).
Given a well-lit and well-composed chroma key scene, the high-
quality chroma keyer used in the Model 1200 can produce a clean
and natural-looking key with smooth edges and realistic
shadows, even when the chroma key scene contains smoke, glass,
or liquids.
Creating a chroma key is especially easy with the 1200 Chroma
Key Auto Setup feature. This feature automatically sets up the key
when you identify the background color. In addition, the Chroma
Key Menu gives you several controls for fine tuning the key.
Figure 4-6. Chroma Key
ForegroundVideo
Background Video
B L U E
Foreground Keyed Over Background