I played with it a bit more just now and I'm very close! For anyone who stumbles on this thread in the future I found that in Resolve if I disable automatic col

I played with it a bit more just now and I'm very close! For anyone who stumbles on this thread in the future I found that in Resolve if I disable automatic color management, and set the output color space to "ST2084 500 nit", then the gamma seems to match Quicktime exactly (though I'm not a professional). It's still clearly going over 500 nits in the viewer, so I guess that's some sort of baseline that matches the "default 500 nits but go over for HDR" that Macs do. The colors are still just a bit off and I think that might be something about how Quicktime and Resolve are interpreting the Sony HLG3 colors which don't exactly match the standards. I might try some of the normalization products offered here[0] later when I get time. [0] https://xtremestuff.net/sony-and-hybrid-log-gamma-hlg/ https://xtremestuff.net/sony-and-hybrid-log-gamma-hlg/