Garbage mattes

Shooting off the green screen

There will be times when you can't achieve edge to edge coverage with your green screen. For example, if you're shooting a very wide shot and you simply run out of green area. "Shooting off" the green area isn't necessarily a problem though. As long as your foreground subject has a decent border of green screen around it, then the rest of the frame (which isn't green) can be fixed with a garbage matte.

Garbage matte

A garbage matte (so called because it hides the garbage) is laid over your shot in post production and simply covers anything that isn't green with a computer generated green matte. The background image is then composited onto this replacement green background.

This can be very useful as it means you can have lights or maybe a boom microphone "in shot" because you know they will be covered later with a garbage matte.