ABSTRACT
The term keying is used to describe the process of removing part of a layer to reveal the layers beneath it. This is usually used to refer to the removal of a blue or green screen background for compositing. This chapter presents an example of a recent project the author did using the keying tools. If the concept of keying intimidates the readers, then they may want to skip ahead and come back later to the Color Difference Key effect. This effect works really well, and can even key out tough jobs (like smoke or wispy hair) better than most. The Color Key effect is probably the polar opposite of the Color Difference Key effect. The Inner/Outer Key effect functions similarly to the Extract plugin in Photoshop. There are the standard keying tweaks, such as Edge Thin, Edge Feather, and Edge Threshold. But there is also an Invert Extraction checkbox.
