Use the Keyer RGBCMYL to extract a key by adjusting tolerance and softness using red, green, blue, cyan, magenta, yellow, and luminance ranges.
To access the Keyer RGBCMYL menu, use:
Batch, then select a node from the Node bin.
Timeline, then use Batch FX (see Creating Batch FX).
The Modular Keyer, then select a node from the Node bin.
This node accepts a front clip, and outputs a result.