Compositing is a technique by which one shot is super-imposed on another, resulting in a composite shot. A common example is our everyday weather forecast on TV. The weather map is a separate computer generated shot onto which the announcer is super-imposed, making it look as if he/she is standing in front of a giant TV screen flashing different weather images.


By separating the foreground and the background into distinct layers, we can manage each layer with much more control. As you will see, this technique alone has given rise to enormous possibilities in the special effects realm. Let us study this technique with the help of an example. The following shot involves flying a plane through a congested city, between tall skyscrapers. Obviously, this is a very risky shot, and would not be permitted by any sane mayor of any large city. The only alternative is to resort to special effects.

Sources : Internet

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