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:
- Editing the picture.
- Editing the soundtrack.
- Adding visual special effects - mainly Computer graphics and digital compositing.
- Adding audio sound effects - like ADR, Foley, and Sound Design.
Other film production stages include (very broadly) - financing, writing the screenplay, rewriting the screenplay (repeat), and the actual shooting.
Major post-production companies
