Subtracting one key from another’s alpha

[Sam Treadway]

This is assuming you are on the color page and not Fusion:

For simplicity I’d have two corrector nodes set asside from the main nodes, each with their own keys.
Create a key mixer node by right-clicking in an empty area and pipe the blue matte outputs to the inputs of the key mixer.
Then pipe the output of the key mixer into your main flow of nodes.
Now with the key mixer node selected, open the key panel at the bottom (rectangle icon with stickman).
For each input you will see two buttons with circles representing key coverage (matte/mask controls — normal/inverted).

You can also reference the manual.
In DR16 see page 2340-2344

[Marc Wielage]

Generally I don’t recommend free Resolve tutorials (because they’re generally worth what you pay for them), but Daria Fissoun — now a full-time trainer with Blackmagic — did this one some years ago which covered the Key Mixer:

https://www.youtube.com/watch?v=GQht1vTv3O0

Not a lot of people grasp the importance and usefulness of the key mixer, but she covers this very well.

In your specific case, there might be a way of doing this with multiple masks, using one as a window and the other as a mask (subtracting from it), but I’d have to see it to know if it would work. I constantly run into Occlusion problems with certain kinds of windows or keys, and generally tracking masks can help avoid or minimize the problem. The beauty of Resolve is often there are multiple methods to solve the problem.

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