More > JRiver Media Center 31 for Windows
JRVR Video Renderer
jmone:
OK - found a better way to do print screens when in Windows HDR Mode (Win + Alt + PrtScn and then look in your C:\Users\[USERNAME]\Videos\Captures for the "sdr" PNG version). Still looks funky but it shows the results much less weirdly than a straight PrtScn and closer to what you really see. In real life viewing the gradients are much smoother.
So this is a "2020 10,000nit HDR HSV Sweep Test pattern. The top pics are with "enable HDR to HDR Tone Mapping" and "Reduce Gamut to DCI-P3-D65 (in BT.2020)" ON with a HDR to HDR Target Peak Nits set to 1000. The bottom pics are with these off for comparison.
As Hendrik says, tone mapping is an ongoing journey and the changes from 31.0.23 to 31.0.24 is a big step up for the undersaturation of Purple, though it looks like there is still a bit to go to get in fully linear like the other primaries.
Hendrik:
Taking fully saturated high brightness color and trying to fit it into an image thats not only lower brightness, but also more limited gamut range, is always going to be a trade off. Its usually a combination of desaturation and losing some details. Or rather, minimizing both. If you want perfect saturation, you could clip the color space, but you lose detail then. Or if you want perfect detail, you can go full on desaturation. The mode we use is called "perceptual" which tries to balance these.
I could put the option back in to let you choose between these three modes, but I don't believe the other two (clip and desat) are really worth using outside of making pattern look good.
JimH:
--- Quote from: Hendrik on June 20, 2023, 06:25:35 pm ---I could put the option back in to let you choose between these three modes, but I don't believe the other two (clip and desat) are really worth using outside of making pattern look good.
--- End quote ---
Dieselgate didn't turn out well for VW.
My money is on Hendrik and Niklas.
jmone:
Nope - I'm happy to stick to the mainstream! As you say, there HAS to be a trade off. Well until we get better displays and tone mapping is no longer required!
Test patterns are no match for just watching stuff in real life, but they are good at showing what is being done behind the scenes. The real goal is to have Skin tones look right as we are all very sensitive to that. I don't care if say a red or purple dress's hue is slightly different as I have no mental reference on what it should look like in real life anyway. As long as it is not obviously over or under saturated then who cares?
Plus (and as I said), these SDR screen shots of an HDR screen are at best wonky and you have to look at the test pattern in real time where you can see the impact of Tone and Gamut Mapping. That HSV test pattern does show how well the changes have gone with the mapping of Red and Green both with the reduction of luminance and also gamut. They look perfect in fact (at 1000nits and P3) on my monitor, with nice blending from one hue to another and nice blending from one luminance to another. The only one that does not look perfect is the Blue which (on my screen) shows issues with the transitions on the red side all through the luminance range but it's mostly at the med to low nits.
Also this is a big step up from the prior version, and is also much much better than what my display can do natively. Notice how the bottom two shots in the image have no graduation at all? Really not good. The JRVR version are nice and smooth (with the exception of the Blue / Red transition) the rest looks spot on (eg Red to Green and Green to Blue look great). I'll see if I can film this. Edit: Nope - poor idea.
jmone:
FWIW - I had a poke around a later madVR release with this test HSV Sweep. Hard to compare exactly with JRVR as I don't think madVR can even do P3 in 2020 (win for JRVR). So in just comparing tone mapping from 10,000 down to 1,000nits (without gamut mapping), JRVR looked better with the luminance graduations and between red to through yellow to green through cyan to blue. madVR better on the blue though magenta to red. The Blue to Red transition and Blue at higher nits must be harder for some reason as while the transitions looked smoother on madVR, it still was not that great.
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