Monochrome image

Hi,

I’m just going through Steve Wrights book Digital Compositing and I’m trying to ‘roll-my-own’ keyers from his flow diagrams. I’ve hit a bit of a snag though as i don’t know how to get the monochrome version of an image. I know it’s simple but it’s got me stumped. Do i create a new channel on the image and do (r+g+b)/3 for it?

Anyhow thanks in advance as usual
Chris

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