Picture lock
Encyclopedia
Picture lock is a stage in editing a film
Film editing
Film editing is part of the creative post-production process of filmmaking. It involves the selection and combining of shots into sequences, and ultimately creating a finished motion picture. It is an art of storytelling...

 or editing a television
Offline editing
Offline editing is part of the post-production process of filmmaking and television production in which raw footage is copied and edited, without affecting the camera original film stock or video tape...

 production. It is the stage prior to on-line 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
Online editing
Online editing is an older post-production linear video editing process that is performed in the final stage of a video production. It occurs after offline editing...

 and audio mixing
Audio mixing (film and television)
Audio mixing for film and television is a process during the post-production stage of a moving image program by which a multitude of recorded sounds are combined into one or more channels...

. Any last minute changes can force portions of subsequent work to be re-done.

Not every production necessarily obeys picture lock. A director or executives in charge may change their minds and ask for additional changes to be made.
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