Limelight
What is a Green Screen?
A green screen is a uniformly colored backdrop, usually bright green, that lets chroma key software replace the background behind a subject.
A green screen is the physical backdrop half of the chroma key process. By placing a person or object in front of an evenly lit green surface, software can detect that exact color and swap it for any image or video. The cloth, paper, or painted wall itself does nothing; the replacement happens in the compositor.
A green screen differs from a virtual background that uses AI segmentation, which estimates where a person ends without any special backdrop. Green screens give sharper, more stable edges, especially around hair and fast motion, but they require space, lighting, and setup that AI backgrounds skip.
In streaming and recording, a green screen frees a presenter to float over gameplay, slides, or a shared desktop. It belongs to the camera-and-compositor pipeline. Limelight operates on a different layer entirely: it adds cursor spotlights, keystroke displays, and freehand drawing on top of your live macOS screen, and it never records or replaces a background.
Why Limelight
- ▸Most effective when lit evenly and separately from the subject to avoid spill
- ▸Works with chroma key software to produce a transparent background
- ▸Available as fabric, paper rolls, painted walls, or collapsible panels
- ▸Not required for AI-based virtual backgrounds, which trade edge quality for convenience
Cursor spotlight free · from $2.99/mo or $34 lifetime · macOS 14+
Or get Pro — from $2.99/mo · See how it works →
free to start, then go Pro from $2.99/mo or a $34 one-time lifetime license. macOS 14+, notarized by Apple.
FAQ
- Do I need a green screen for virtual backgrounds?
- Not always. Conferencing and streaming apps can blur or replace backgrounds with AI segmentation, but a physical green screen still gives the cleanest edges.
- Is a green screen related to Limelight?
- No. Limelight is a screen-overlay tool for highlighting your cursor and keystrokes on macOS. It has no role in camera compositing or backdrops.