How it works
Bright green is common because it differs from most skin tones and camera sensors capture it efficiently. Blue screens are used when costumes, props, or lighting make green a poor choice.
What people often miss
Clean results depend on even lighting, camera quality, and preventing green spill from reflecting onto actors. The technique is called chroma key compositing.
Why this question comes up
Behind-the-scenes footage often reveals that elaborate environments began as plain colored stages.
Key points
- A green screen lets editors replace a uniformly colored background by selecting that color and making it transparent in post-production.
- Bright green is common because it differs from most skin tones and camera sensors capture it efficiently. Blue screens are used when costumes, props, or lighting make green a poor choice.
- Clean results depend on even lighting, camera quality, and preventing green spill from reflecting onto actors. The technique is called chroma key compositing.
Bottom line
A green screen lets editors replace a uniformly colored background by selecting that color and making it transparent in post-production.
Source and verification
This Answer was checked against Academy of Motion Picture Arts and Sciences. Follow the source for the full official explanation and any later updates.