As mentioned earlier, Chroma Keying is a skill on its own that takes a lot of practice to do properly. When done poorly, Chroma Keying looks really low budget and obviously fake. However, there are a couple things that even a first-time "Chroma Keyer" can do that can improve the quality of their work.
Lighting is the most important part of Chroma Keying. You can never be too careful with it. Take extra care properly lighting your background, and use large white cards to bounce light so that you can achieve even illumination across the entire screen. Remember, different degrees of illumination can create color variations that can confuse your digital camcorders.
Also, be aware of the potential for color spill. You will see color spill as a blue reflection off of your backdrop that colors your subject. In this case, double check the lighting on your subject (again, nice even lighting to eliminate shadows) and then have the subject move farther away from the background screen if possible.
Matte sprays can be attained from your local photography store or even art store. These are useful in reducing the reflective properties of your subject (especially if they have a bald head!) and can greatly reduce color spill or color bleeding.
Editor's note: You may also find a video proc amp (short for video processing amplifier) to be useful in controlling color, matching cameras and so forth for getting the best chroma keying results.
Keeping these tips in mind, you should be well on your way to the exciting world of Chroma Keying. Remember, like anything worth doing, practicing your Chroma Key skills will hone them and turn your boring old home videos or wedding footage into exciting, Hollywood-style action!
Source: http://www.signvideo.com
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