This Video tutor Helps to How to work in Green Screen Mate, very easy
When working with digital video, it is often necessary to place people or objects into virtual scenes, typically by filming the subject in front of a green or blue screen and replacing the background. This process is called "keying," and it can be very difficult and time-consuming. Ultra is a full-featured application included free with Premiere Pro CS3 that aims to make high-quality keying fast and easy.

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