Chroma key photography is where the subject is photographed in front of a solid-color background -- usually green or blue -- that can easily be removed in post-processing using a program like...
iMovie '09 has basic Green Screen editing built in. To access this ensure that the Advanced Tools option is ticked in the general section of iMovies Preferences.
Drag your "green screen" video onto...
Final Cut Express 4 has a Chroma Keyer Identical to the one in Final Cut Pro, Final Cut Express also has other Keyers like Color Key, Luma Key, Difference matte and a host of others.