Microsoft did something like this for their HDR output on Gears of War and Forza Horizon. I’ve been playing around with something like this in the following three videos and the problem you run into is that the gamma curve for SDR content cannot be linearly adapted to an HLG or PQ gamma curve, as those usually transfer a lot more into the highlights. That means, that the majority of videos you would convert like this would end up being too dark. And just brightening midtowns results in weird looking shots, with some being too bright and some too dark. Unfortunately, that’s the reason why movies usually receive a separate SDR and an HDR grade. But again, it would be nice, if you guys could find a way to solve this somehow, maybe video game footage isn’t that bad of an idea, as you can create perfectly identical scenarios in SDR and HDR.
