I think you may have misunderstood what I mean. All of what you say here is correct. I’m from the ICC world, and most colorspace ICC profiles are matrix profile, and can only do gamut clipping in theory, some CMM cheat a little bit. Here is a perfect example of what I mean, on the left is perceptual gamut mapping, and on the right, plain gamut clipping. The flower photos I take, looks almost as bad the right photo when converted from the camera colorspace to Adobe RGB ICC profile of my monitor. I have created ICC profiles versions of sRGB, Adobe RGB, ProPhoto, and soon Rec2020 made with 3d LUT, which will allow gamut mapping, contrary to matrix profile. I can also create ICC device link profile that do an even better job, and can be translated into LUT.
I’m trying to use my DSLR stills, which in my case mean a 14 bits depth and 14 stops, either alone, or merge into EXR, without tone mapping, to create HDR slideshows that I can upload to YouTube.
If your images or even your video clips colors fit with minimal or without clipping into say Rec709 (sRGB), you’ll never see that much clipping, if any, of course. Trust me, my shots are almost always way out of the gamut of Rec709 and even out the Rec2020 gamut quite often.
I’ll most likely do the following, first I’ll do a perceptual gamut mapping from ProPhoto RGB to DCI-P3 or Display-P3 and then to linear Rec2020 or to HLG Rec2020. That way, for any display capable of 100% P3, it will never require clipping. Of course, on an SDR, Rec709 display, it’s another story, but it seems we can provide a LUT for YouTube to use in rendering Rec709, I’ll make sure there is no clipping for SDR viewing as well.
