First of all, congrats for all the progress on JRVR. I tried it with MC28 and it was very far off the mark, I skipped MC30, and I tried again with the latest MC31, and the improvement is impressive.
I still have a few issues that are set-up / calibration related:
Gamma IssuesWhere do you specify the gamma response of the display, so that tonemapping can be done properly? PQ is absolute, not relative, JRVR needs to know the display gamma response to tonemap PQ to power gamma. My JVC NZ8 (RS3100) is calibrated to P3 / gamma 2.4 (very precisely, with an internal 1D LUT, so I know that the display gamma tracks 2.4 exactly).
In madVR, I simply specify that the display is already calibrated to P3 and gamma 2.4, and I get the expected results (correct colors, no black or white crush). With JRVR, there are issues with both black crush and highlights compression, especially when DTM is enabled.
If I specify a gamut of P3, the color are mostly correct, as long as I select a contrast of at least 10,000:1 (lower contrast values are way oversaturated, at least on my 100nits peak display, using a 100nits peak brightness value).
However, there is no way to get a correct gamma response. With gamma processing disabled and the actual native on/off contrast specified (custom / 30,000:1), there is sever black crush. If I specify 2.4 gamma processing (which isn't what I want, I only want to indicate the gamma response of the display/PJ), the black crush is still present. Even with gamma processing at 2.8, there is still significant black crush. I get closer if I select a 10,000:1 contrast (instead of the actual contrast), but there is still black crush. You can look the camp fire scene in the Revenant, most of the detail (that is meant to be visible) is lost.
DTM IssuesIn order to display a dark scene such as the camp fire scene in The Revenant (strarting around 00:19:57, about 6 nits), you need to enable DTM in the advanced settings. However, as soon as DTM is enabled, it severely crushes highlights, leading to a loss of details that actually matter. For example, if you play Lucy, at the very beginning, just after the opening credits (from around 00:01:40), you'll see that the details on the cliff behind the caveman are crushed. More importantly, in the scene when she walks into the hotel lobby (around 00:05:30), all the details in the sky above the trees is completely lost with DTM. You should be hable to see a building, it's gone. I've selected "spine" which seems to be the best curve (BT2390 is completely off, not sure why it's even there).
So I guess my questions are:
1) How do you specify the gamma response of a calibrated display so that you don't get any black crush with a gamma 2.4 baseline?
2) How do you get JRVR to display dark scenes (such as the campfire scene in The Revenant) without losing brightness / saturation, which basically means enabling DTM as would be expected, but keep detail in bright scenes such as the Lobby entrance scene in Lucy?
These are just two examples, but these issues are present with all content.
I hope it's just me being unable to set JRVR properly, I really like what it does most of the time, and I haven't experienced any obvious oversaturation, but the black crush / wrong gamma and highlights compression when DTM is enabled are two deal breakers here.
I also have some 3D LUT questions but I'll start with the above for now.
Thanks!