Using the Chroma Key and Videomerge effects

…You no doubt encounter chroma key effects on a…regular basis, whether you're aware of it or not.…Keying removes the background from behind an actor, for…instance, and replaces it with any real or imagined background.…And you'll see this process used in everything from big…budget fantasy and science fiction movies, to nightly TV weather reports.…Now you can do it on your home computer, how cool is that.…The basic principles of…chroma key or video merge, are that we take a video…that has a green background or a blue background, any kind…of smooth colored background, and we make that background transparent so…that another video or a still photo behind it becomes its background.…

So we have a chroma key clip here.…I'm going to double click it to open it up in the clip monitor.…And you see what we have. It's a bicyclist and he's in front…of a green background.…Now, one real important thing if you're going to try to do a chroma…key effect, and that is make sure that you have a well shot key shot.…This is a beautifully shot key shot. Notice the background is evenly lit.…