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— To limit the output to the intersection of both keys: Turn on the Key Input Matte button for either Input Link 1 or Input Link 2.
Turning on Matte for Input Link 1 to output the intersection of two mattes
— To invert the resulting matte you’ve created: Turn on the Output Link Invert button.
When you’re finished, if you choose to subtract Node 3’s key from that of Node 2, the result should resemble the following screenshot.
The result of subtracting a key of the man’s face from a key of the overall midtones of the image, and using that to add a selective green tint
Adding Inputs to Key Mixer Nodes
New Key Mixer nodes have two key inputs by default. If necessary, additional inputs can be added in order to combine even more keys with one another.
— Drag the Key Output from a corrector node to the Key Mixer.
— Right-click a Key Mixer node, and choose Add One Input.