Keying > Inner/Outer Key effect (Pro only)

The Inner/Outer Key effect isolates a foreground object from its background. Even objects with wispy, intricate, or undefinable edges can be clipped from their backgrounds with minimal work. To use the Inner/Outer key, create a mask to define the inside and outside edge of the object you want to isolate. The mask can be fairly rough--it does not need to fit exactly around the edges of the object.

In addition to masking a soft-edged object from its background, Inner/Outer Key modifies the colors around the border to remove contaminating background colors. This color decontamination process determines the background's contribution to the color in each border pixel, and removes that contribution--thus removing the halo that can appear if a soft-edged object is matted against a new background.


The original masked layer (left) and the background layer (center) are combined using Inner/Outer Key (right).

Related Subtopics:

Applying the Inner/Outer key