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Gamut Mapping is a wonderful feature. I use that shot-to-shot if I run into scenes with intense car tail lights or (say) a scene in a nightclub with neon signs. It does something similar to a hue-vs-sat curve, but it targets it in a more subtle way. I don't like the idea of legalizing a show with a "one size fits all" clipper, but an occasional Gamut Mapping node will do the job when you see an illegal gamut excursion on a Gamut scope or a Diamond scope. 

I have had whole scenes of 70 or 80 shots that was all nightclub interiors with intense background signs, and for that, I'll either do a group grade with a Gamut Mapping node or I'll have a fixed node tree with one node just dedicated to legalizing. That's assuming I'm delivering Rec709. If we had an HDR pass, I'd dupe the session and create a new version with no Gamut Mapping and just let it blow.

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