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CHAPTER 10
CHROMAKEY
You’ve probably seen the chromakey effect used in television weather reports. The weather
person stands in front of a “blue screen” (a solid blue background) and the weather map then
keys onto the background from some other source.
Chromakey combines two sources to create a composite image.
Chromakey requires careful preparation of the input sources to achieve the desired effect.
Keep the following points in mind:
Using Chromakey you can
combine two completely
separate images to create a
composite image that might
be impossible to create any
other way.
One source has a
solid colored
background, such as
a blue screen.
The other source
can be any video
image.
The chromakey effect replaces the solid colored
background in the first image with the video
signal from the second image. The second image
replaces the background only where the
designated color appears.
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