I have been familiar with Drew Carey's Green Screen show for quite some time. While I don't believe it to be as good as the old standard Whose Line is it Anyway? the show is still quite innovative and creative.
A green screen system works by method of color replacement. A computer is connected to a camera and is given a specific color that is intended to be replaced by a video overlay. The background color to be replaces is not restricted only to green. Virtually any color is available for replacement. There is one fairly large caveat to green screening... Your video personalities can not be wearing the color to be replaced or they will end up wearing part of the replaced image. An example of this phenomenon can be found here. (Note the weather man's tie is changing with the background)
This is actually my favorite use of green screen. I have been a total weather nerd since the summer of 2003 when I basically had to live in the hospital for a summer. When you don't really get to go outside too often, the weather becomes your window to the world.
In recent history, green screen capability has been released to the public at a consumer level. No longer are expensive all-green rooms and high-powered computers needed to obtain this media altering technology.
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