This is a simple node for keying red, green or blue. But instead of just taking one channel, shuffling it into the alpha and grading it (what a regular Keyer, set to red, green or blue, is doing), this node subtracts the other two channels from it (similar to what Keylight and other keyers are doing, for example).
This makes it much easier to key red, green, or blue objects against a bright background, for example.
First submitted: 17 December 2025
Author: Jakob Kardoeus
Compatible Nuke versions: 6.0 or later
Compatibility: Source
How to use this tool:
1. In the "operation" dropdown, choose which color you want to key.
2. With the "weight" slider you can specify which other channels should influence the key. 0.5 means that the average of the two other channels is subtracted from the channel you want to key.
3. With the "tolerance" slider, you can specify the tolerance of your key. This is just a multiplier of the other two channels before they are subtracted.
4. The "range" behaves like the "range" in a regular Keyer node.
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