How To: Key a green screen using After Effects

Green screens are clever devices that have saved movie studios millions of dollars in production fees because of their ability to let you tack on any background you desire digitally.

Replicate the high-quality green screen keying used in many movies by watching this tutorial on how to key green screens using After Effects. You can use the money you'll save on the set on more important things like a swanky leather jacket for the lead star and catering from Pink's Hotdogs.