When keying in AE, I make a mask and cut out parts of the image that I don’t need. Then I apply a keyer.
In Nuke, this doesn’t seem to work for me. After my read node I add a Paint/Roto node and make a mask around the area I want to cut out. I tell the node to affect the alpha channel only and then I add a premult. Perfect. But as I merge my fg to my bg, the same garbage matte gets applied to the bg as well. I can’t seem to figure out how to make this work. The only work around I have at the moment is to color my garbage matte green and key it out.
In AE I also like to pull a hard kay, dialate it and get an automated garbage matte without having to keyframe, that I then stencil over my next layer. How do I do this in Nuke? I do a hard key, dilate it and then stencil the matte over the original and I get the same result. But again, after I add my keyer and as I merge it, this automated garbage matte affect my bg as well.
What am I doing wrong?
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