Blue key generation is a process, which inserts of one video picture into a predetermined area in another one, through the use of special hardware. The primary picture is shot with the subject against a special blue tinted background. The blue content of this signal is then removed and the second picture is inserted in that area where the blue background was located. Blue keying is a very important special effect, which is often used in news broadcasting where pictures of the news being discussed are viewed on a screen behind the anchorman. An extension of the Blue Key is the Chroma Key.
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