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Lesson 9. Superimposing > Applying the Blue Screen transparency key type

Applying the Blue Screen transparency key type

The two most commonly used transparency keys are Blue Screens and Green Screens. These keys are generally used to substitute the background of one video clip with another and are favored because they do not interfere with skin tones. For example, TV news programs regularly use blue screens to display footage of the current topic behind the newscaster.

If you use a blue or green background when videotaping footage, and plan to key it out using the Blue or Green Screen key type, make sure everything that is to remain opaque is a color other than your key color. For example, if you film a newscaster in front of a blue backdrop and the newscaster is wearing a blue tie, the tie will become transparent along with the background when you apply the Blue Screen key type to the footage.


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