Knoll Unmult equivalent for Nuke???

Hi, I’m looking for a way to key out elements like fire, smoke, etc, from dark backgrounds the way I’m used to in After Effects: using Knoll Unmult, wich geenerates great alpha mattes from dark background elements.

Recently I’ve needed to key out some fire and the only working solution was using luminance keying cause doing a simple "screen" wasnt working since it doesnt retain the shadows.

Thanks.

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