Final locking of all editorial decisions – final cut is released for color grading, VFX, and sound mixing. Subsequent changes are costly and labor-intensive.
Technical Details
Picture Lock involves creating a final Edit Decision List (EDL) with exact timecodes, defining all in and out points of used clips frame-accurately (at 24fps = 41.67ms precision). Modern workflows utilize AAF or XML files from Avid Media Composer, Adobe Premiere Pro, or DaVinci Resolve. The frame rate is finally set to 23.976fps (cinema), 25fps (PAL), or 29.97fps (NTSC). Concurrently, a reference QuickTime in ProRes 422 HQ or DNxHD 175 with burned-in timecodes and audio tracks at 48kHz/24bit is exported for subsequent departments.
History & Development
The term originated in 1974 at Lucasfilm during the post-production of "Star Wars," when George Lucas first employed computer-generated timecode lists for coordinating picture and sound editing. Previously, locking was achieved by physically splicing 35mm cut film. In 1989, Avid Technology introduced the first fully digital non-linear editing system, the Media Composer, which enabled picture lock at the touch of a button. Since the 2000s, handoffs are entirely digital via project files instead of physical edit lists.
Practical Application in Film
After Picture Lock, color correction, sound design, and visual effects begin their final stages. For "Mad Max: Fury Road" (2015), Picture Lock was achieved after 18 months of editing, with a final runtime of 120:23 minutes. Change requests after the lock require a "Recut" with new timecodes for all subsequent departments. Streaming productions like Netflix series often use "Temp Lock" – provisional locks for individual episodes during ongoing season production. Picture Lock typically occurs 6-8 weeks before the planned delivery date.
Comparison & Alternatives
Picture Lock differs from "Fine Cut," which is the penultimate edit version, and from "Delivery," the final mastered product. "Rough Cut" refers to early edit versions without fine-tuning. "Temp Lock" allows for limited changes during parallel VFX work. "Conform" refers to the technical transfer of edit decisions to high-resolution material after Picture Lock. Modern cloud-based workflows permit "Rolling Lock" – sequential locks for series productions rather than complete episode locks.