Yes, this mechanism should generally eliminate the need for a LUT. However, some user reports indicate that some games bypass the core DirectX mechanism and require a LUT. Or perhaps they're using an older operating system other than current 10/11 or these games are using prehistoric DirectX interfaces. Remember that this built-in OS tone mapping feature hasn't always been present in Windows; it only arrived with a major update to Windows 10 a few years ago. Since people assume I have a crystal ball, they don't bother providing details like the Windows version they have.

However, if capturing responds to your brightness correction change, it means the core pipeline based on hardware capturing is working for you and a LUT shouldn't be used. There is no way to automatically control these parameters, but if you use Windows 11, be careful because it has several OS features that can completely ruin the gamma, as you are warned about in the FAQ.

thanks for the reply.

this was tested on two PCs both running latest Win11 with the "Automatically manage color for apps" setting turned off in windows and HDR activated (both running nvidia GPUs w latest drivers).

this problem occurs in all games (only tested new games) and Desktop respectively

but if i understand correctly then this cannot be adjusted (i.e. brighter in low light conditions but same brightness in bright conditions) and i will be better off not using directx screen capture and get a sophisticated splitter that does 4k/120hz/HDR/VRR

It would probably be possible to add additional gamma correction to bring out darker colors at the pixel shader level, but I'm absolutely not in the mood to mess with it again right now, especially since the OS has already messed with the gamma and we don't know if the effect will be satisfactory and we already have premium solutions based on P010. Maybe someday...