My experience with an outboard (Wavetek/Leitch) scope is that it is pretty much impossible to generate any luminance values above 100IRE out of Resolve. You can crank the gains until the cows have come home, had dinner, brushed their teeth, done the crossword puzzle and gone to bed, got up again to get a glass of water, watched the news, and then went to sleep.
Also in my experience, the FCP “legalizer” is a joke, a bad one, worse than the cows coming home, etc.
You are allowed up to 102IRE in most cases, so a little bit of “fuzziness” is not going to be the end of the world. What is omitted in the FCP version is that it utterly fails to deal with anything around the 0 IRE area, which can be just as critical — especially if you’re dicking around with flipping between Linear 709 and full scale RGB. Be careful with that, especially if you are using ProRes 4444 and particularly if you’re migrating between applications and systems. I’m thinking specifically about Media Composer and After Effects.
The reality of the 120IRE threshold is that it is combined Y+C that is of concern for that parameter. Something that is somewhat difficult to simulate for most digital scopes…
jPo
You mean “Old Ben”? Ben Kenobi?