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(Top) An entire clip with a high-contrast grade, (Bottom) The skin
tone graded differently from the high-contrast grade using a key
This example could have been handled in a variety of different ways, but the point is that you
can add nodes that connect to the state of the image at any part of a node tree, and use them
to generate keys to feed to any other node, regardless of what’s happening to the picture
in between.
Connecting Key Outputs to
RGB Inputs, and Vice Versa
There’s another way you can manipulate a key from one node using another in the Node Editor,
and that’s to connect the key output from one node to the RGB input of another node. When
you do this, you can use any of the controls of the second node to manipulate the key, and you
can then use the result by connecting the RGB output of the second node to the key input of a
third node.
Connecting a key output to an RGB input to adjust a key with a second node’s controls
In the node tree shown above, Node 2 pulls a key, Node 4 manipulates the key, and Node 3
uses the key to make a color adjustment.
Chapter – 126 Combining Keys and Using Mattes 2857