Devices > Video Cards, Monitors, Televisions, and Projectors
HDR interactions between Windows and MC settings
tij:
HDR is confusing indeed … simply put whole screen can either be HDR or SDR … you cannot have part of screen HDR and another part in SDR (for example whole desktop is HDR and IE window playing SDR content in SDR)
Same as progressive and interlaced ... its either one or the other … cannot have part of screen progressive and another part interlaced
This problem only presents itself for PC … as there are many windows open some of which with SDR content … some of which in HDR content
There is no way for application to know when its appropriate for them to switch to HDR/SDR … imagine you working in Photoshop (SDR), then you open HDR clip in Chrome browser … Chrome has no idea if its appropriate to switch to HDR mode (if it does, it will screw colors in Photoshop) … so it does what's best without disturbing other apps - it converts HDR clip to SDR
Only apps working in full screen (whether windowed or exclusive) can determine when can switch to HDR/SDR … and that's up to developers to enable this feature … which MadVR does
Now to your specific problem … as I understand it - if you put OS HDR off … MadVR is unable to switch your projector to HDR mode when playing HDR content? … can you tell which Nvidia GPU you have and its driver version … can you also attached screenshot of your MadVR setting - specifically under [devices]->["your projector"]->[hdr]
Also … I am pretty sure you must calibrate your projector separately for HDR and SDR content … they use different color spaces (rec709 and bt2020) … UNLESS you do tone mapping in PC
As I mention before its possible with MadVR to do tone mapping HDR->SDR … so your whole system can run in SDR … SDR content then display as SDR … and HDR content gets tone map to SDR by MadVR
Again as I mention before, there is nothing on PC that can tone map SDR->HDR … so if your whole system run in HDR … your SDR content will look washed down
sirkus:
Please, check this https://www.pcworld.com/article/3269591/windows-10-april-2018-update-hdr-settings.html
--- Quote ---Microsoft’s big Windows 10 April 2018 Update adds a new option in the form of a “Change brightness for SDR content” slider that doesn’t affect HDR content.
...
if you aren’t a color snob, you can actually use your PC if you leave HDR active now
...
The April 2018 Update makes huge strides forward, though, and the new SDR brightness setting means you can finally multitask while watching HDR videos
--- End quote ---
This is w/o calibration. In my case, with a dedicated calibration, things look pretty good. Enough to let it always on. That's why I try to understand why the only answer is to disable HDR in Windows for MC.
sirkus:
Now to answer your question...
--- Quote from: tij on November 09, 2019, 10:26:56 pm ---Now to your specific problem … as I understand it - if you put OS HDR off … MadVR is unable to switch your projector to HDR mode when playing HDR content? … can you tell which Nvidia GPU you have and its driver version … can you also attached screenshot of your MadVR setting - specifically under [devices]->["your projector"]->[hdr]
--- End quote ---
Finally, I have found the issue that doesn't enable HDR in MC when OS HDR is off. I was on Custom Video Settings -> Start with -> Red October HQ -> apply the following rules -> ffdshow -> LAV Video Decoder. I use it for SmoothVideo Project (SVP). Does it mean that it will not work anymore (at least with OS HDR off)?
And when OS HDR is on, I have seen it to work a few times but, I can't reproduce it. With the same settings it doesn't work anymore.
I am on Nvidia 2070 RTX, latest driver.
In madVR I have tried "let madVR decide", "passthrough HDR content to the display" w/ and w/o send HDR metadata to the display.
tij:
what you want ... i dont mind having too ... leave things in HDR ... where HDR movies work and SDR movies work too
but that will require something to convert SDR colorspace to HDR colorspace ... ideally Windows should handle it ... but as of now it does not ... it offeres some slider to adjust SDR to be barely acceptable
carefully read article you refer to ... it clearly said that SDR colors are still off ... usable compared to what was offered before - yes ... acceptable for applucations where color matters (video, photoshop, etc) - no
you cannot convert SDR colorspace to HDR by simply adjusting brightness and saturations ... i wish it was that simple too
now ... it might be possible (though i highly diubt it) to calibrate your display so whatever garbage Windows outputting for SDR is map to correct SDR values (probably what you were trying to do) ... but then you will screw up HDR content (it will look garbage)
I wish i can tell you different thing as it also benefits me ... but atm to enjoy movies in correct colors ... you need to run SDR content in SDR mode and HDR content in HDR mide (both modes separately calibrated) ... madVR offers auto switching between these modes which works nicely
alternatevely, can run everything in SDR and fir HDR content use madVR to do tone mapping
tij:
now i remember ... the thing that converts SDR to HDR ... it was Sim2 dual projector setup for HDR ... ppl who saw it says it is next best thing after Christi :-Xe Dolby Vision projector
that Sim2 converted SDR to HDR on fly ... and ppl say with spectacular results
but it cost small fortune and does not do 4k
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