the Process of intelligently combining two picture sources is also sometimes 'compositing'.
the best known (and probably most often) example for this technique is the newscaster in front of the white house. in tv, the color usually replaced by a picture usually is blue or green, hence the name 'blue/green screening' (the actor stands in front of a blue or green screen). this usually involves much more than using simple transparency masks because it allows you to target any color in one of your movies and make that color transparent. but what does it do? simply Put, it allows you to intelligently blend two movies dynamically. This iMovie plug-in is billed as the “best-of-class compositing ('blue-', 'green-screening') plug-in”.
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