Scripting command:
monochrome [Preset=0...7]
or
monochrome [Red=0...255] [Green=0...255] [Blue=0...255]
This operator has some common presets, but you can use the sliders to set any ratio of RGB components you like. Keep in mind that it is the ratio of the RGB components that is used here; zero red and zero green mean all blue when blue is anything from 1 to 255, and so on.
Additionally, again because this operation considers the ratios of each channel as compared to the others, settings such as 10,20,40 are functionally identical to settings such as 20,40,60 because the inter-channel ratios are the same.
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