Phone Screen Replacement in Post vs. a Live Screen on Set
Short answer: Screen replacement tracks new content onto a phone in post. It is flexible but costs VFX time per shot, and the actor reacts to nothing. A live screen shows the final content in camera on the day: reflections and light on the face are real, the director sees the finished shot, and there are no VFX shots. Use replacement only when content is unknown on the day or the phone must do something impossible.
Step by step
- Count the phone shots. Many short phone moments add up quickly as VFX shots.
- Lock content before the shoot. If the messages, calls and apps are known, build them live.
- Test on camera. Check brightness, refresh-rate flicker and moiré with the real lens and frame rate.
- Keep a fallback. For unknown content, shoot the live screen anyway and replace only if needed.
Common mistakes
- Green phone screens spilling green light onto hands and faces
- Tracking markers left visible on the glass
- VFX budgets running over on dozens of short insert shots
FAQ
Is a live phone screen cheaper?
Usually yes. It moves the work to prep, removes per-shot VFX and finishes the shot on the day.
Does a live screen flicker on camera?
It can at some shutter angles. Match the shutter and frame rate, and lower the brightness to the scene's exposure.
Related guides
- Real phone screen vs. green screen playback
- Making Phone Screens Readable on Camera: Brightness, Moiré and Flicker
- How TV Shows and Movies Show Text Messages on Screen
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