The Post-production reference article from the English Wikipedia on 24-Apr-2004
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Post-production

Post production is the general term for the last stage of film production in which photographed scenes (also called footage) are put together into a complete film.

Post production is in fact many different processes grouped under one name. These typically include:

Typically, the post production phase of creating a film takes longer than the actual shooting of the film, and can take several months to complete.

Other film production stages include (very broadly) - financing, writing the screenplay, rewriting the screenplay (repeat), and the actual shooting.

Major post-production companies