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A Circular Power Window is used to further isolate the woman being isolated.
Manipulating Keys Using Additional Nodes
If you need to make more adjustments to a qualified key than the Matte Finesse controls will allow, you can use the Node Editor to feed the key output of one node to the RGB input of another, at which point you can use all of the second node’s color adjustment controls to manipulate the grayscale image that constitutes that key, to improve it.
Connecting a key output to an RGB input, and then connecting the RGB output back to the next node’s KEY input again
You can also use the Key Mixer node to combine multiple keys in several different ways, adding keys together, or subtracting them from one another, in order to create exactly the key you need.
Adding multiple keys together using a Key Mixer
For more information about these techniques, see Chapter 143, “Combining Keys and Using Mattes.”