Hi there. I didn’t see this specifically yet. I have a Vizio P656-G1, on Windows 10. Nvidia GTX 1050 TI.
The main issue I have is that most of the color is missing. I can see some muted color shades, but it almost looks greyscale. Brightness otherwise seems okay. What setting may be contributing to that issue, to the extent there is one?
Good to have you on board! I’m not sure your graphics card supports HDR - does it? Do you have HDR on in Windows and Retroarch? Basically it sounds like you haven’t got HDR on.
The graphics card does support HDR (tested with other HDR material). Also, my TV switches to HDR mode when Retroarch is open - and other shaders work. Retroarch displays the colors correctly. It’s only when I enable the 4K HDR shaders. The brightness looks fine, just the colors are totally off. Now, my TV may not have an RGB layout. Per RTings closeup, it looks like its GRB. Could this have anything to do with it?
I just checked my GTX 1050 Ti and can confirm that it does support HDR in the Windows settings, although it only works with DirectX in RA not Vulkan.
I’ve posted the following two screenshots. The 4K HDR color looks more washed out when viewed at full screen size. Obviously this isn’t exactly as it appears on the TV itself, but close enough to show the difference.
Arcade 4K HDR: https://imgur.com/xBfXL9H
Easymode (with HDR enabled) https://imgur.com/e9tQ1QX
Ok great stuff - yes that looks totally broken! So let’s strike off some easy things: you’re resolution is 4K? You might have a BGR display - go into the shader parameters and use that option. Set your sharpness on your TV to neutral (either 0 or 50). Set peak luminance in the shader parameters to 1000, paper white luminance to 200 and contrast to 0.0. If that doesn’t work can you get a close up shot of your TV so I can see what the sub pixels are doing. Hopefully we can get to the bottom of this.
Mind if I ask how you got your screenshots? HDR is 100% hardware, a screenshot shouldn’t show a difference. 
@BendBombBoom has this display been professionally calibrated? It could be that sharpness is not set correctly.
Could this be the “Ultra Viewing Angle” layer? According to rtings.com:
“The Samsung QN90A uses a BGR sub-pixel layout, which can affect how text is rendered when using the TV as a PC monitor. You can read more about that here. The pixels look a bit blurry due to the ‘Ultra Viewing Angle’ layer.”
I’m not sure what else could be causing the issue.
Some Plasma TVs used GRB subpixels, but that’s kind of irrelevant here since 1080p is the highest resolution for Plasma TVs.
they have some shots of the viewing angle thing, which looks just like a hazy layer on top of the subpixels.
It’s on the photo on RTings. Although it’s for the 55r617, it’s the same as 55r615 except the remote is different.
I checked by zooming in with my phone on a pure white screen and the farthest left pixels are green while the pixels on the far right are blue.
So I noticed that on RTings but I also noticed they had similar pictures of other TVs that they stated were BGR TVs. Can you look at an image on your TV of alternating white and black vertical lines to confirm?
Yeah that just made my search all the more confusing. Looking again at the pure white pixels, I can definitely say it’s BGR. The far left and right subpixels had a glow through my camera that I mistook for a reflection on the bezel.
I am showing the base image (from what Windows is producing, before being process by the TV) between the two shaders in HDR mode, and so that would show a difference in terms of the underlying starting point.
The point was that there is a drastic difference in colors (even though as I had noted I think that the perceived brightness is the same).
To assist, see the following:
Imgur: The magic of the Internet
which shows phone picture shots (not windows screenshots) of
As articulated, the brightness itself seems fine, just something is up with the colors.
Yes, I have changed the settings to what you recommended.
I will note that in the shader, changing from RGB to BGR appears to make no difference (whereas the brightness ones are readily apparent).
Just one more thing you’re on Retroarch v1.10
Through nvidia control panel I forced my display into 10 bit which helped. Sharpness and contrast have a huge impact on picture so I adjusted that as well. It looks better and I’m getting better colors.
Now I’ve seen too much and cannot un-see it. I’m noticing how odd the Local Dimming feature is on all games. Elden Ring, for example, Bright scenes or setting suns look amazing. I almost have to squint my eyes it gets so bright. Yet in a cave by a small campfire the light is dull. I’d expect the fire to be burning bright. Games on consoles with HDR have similar issues. (Maybe that’s how it’s supposed to be but it doesn’t look right to me.)
I’ll keep playing around and see what more I can do.
