Post-production
This stage is usually thought of as starting when principal photography ends, but they may overlap. The bulk of post-production consists of the film editor reviewing the footage with the director and assembling the film out of selected takes. The production sound (dialogue) is also edited; music tracks and songs are composed and recorded if a film is intended to have a score; sound effects are designed and recorded. Any computer-generated visual effects are digitally added by an artist. Finally, all sound elements are mixed down into "stems", which are synchronized to the images on the screen, and the film is fully completed ("locked").