A film editor’s job is to complete a director’s vision for a film. Once production begins, editors are given raw footage that had been shot earlier that day (or the prior, depending on production schedules). This footage is called dailies. After reviewing the dailies, the editor then pieces them together to create scenes, build a narrative and evoke emotion and tone in a scene.
Scenes are then strung together, creating a larger piece of the movie. Eventually, after the entire film is shot and spliced in the proper order, the editor’s first pass is finished. This first pass is often called an Assembly Edit and typically contains everything (or nearly everything) that was shot for the movie. This is why Assembly Edits tend to run far longer than the final, finished version of the film.
Sometimes, movies are reconceived, restructured and “rescued” in the editing room. This happens after a film’s been assembled and it isn’t quite hitting the standards the director and/or the producers were hoping for.
This can be due to a number of issues, and whether they’re related to narrative, character, performance, emotion or clarity, editing can typically aid in fixing (to varying degrees) these.A number of seminal, genre-defining films, from STAR WARS to ANNIE HALL to JAWS were all aided tremendously in the editing room.