Chroma key is a technique for layering two images together. A color range in the top layer is made transparent, revealing another image behind. The chroma keying technique is commonly used in video production and post-production. This technique is also referred to as color keying, color-separation overlay, Green screen, and Blue screen.
This technique is also used in the entertainment industry, for example for special effects. Such as Pinnacle studio, which makes it possible and relatively easy for the average home computer user, to create videos using the Chroma key function and green screens.example given below:
http://www.youtube.com/watch?v=h298aNxtRsk&feature=related
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