Picture lock is a stage in editing a film or editing a television production. It is the stage prior to online editing when all changes to the film or television program cut have been done and approved. It is then sent to subsequent stages in the process, such as online editing and audio mixing. Any last-minute changes can force portions of subsequent work to be redone.
Picture lock usually follows the successive cuts of a film, such as the rough cut and later refinements of the edit.[citation needed] Once the picture is locked, work that depends on the exact length and timing of the picture, such as sound design, music scoring and final sound mixing, can proceed without the timing of scenes changing underneath it.[citation needed] Visual effects and colour work may also be finalised from the locked cut.[citation needed]
In practice, a locked picture is not always final. If a change is made after the lock, editors may produce a list of the differences between the old and new cut so that the other departments can update their work to match.[citation needed] The meaning and strictness of the term can vary between feature films, television and documentaries.[citation needed]