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JRVR Feature request - Native colorspace playback option

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afss_br:
Thank you all for your replies ! I will try the profile option as it sounds like would do the job for me.

For those who own JVC projetors, please try the following:

1) Play a BT.709 file, while having Media Center set as BT.2020 output, having the projector also set to BT.2020 color profile - play a colorful video with lots of REDs. If possible take a picture of a colorful scene.

2) Change Media Center to output BT.709 (of course, also change the JVC color profile to match BT.709) and repeat the playback of the same file. Watch for the colors, specially RED - if possible take a picture to compare with the previous one. I have a JVC RS540, and I find that colors look more vibrant and natural if the whole chain is BT.709.

karmat63:
I have a related question;
my Epson 9400 VP has a relevant setting, I use for all video materials:
Digital Cinema; it has a color filter on the light path, and complete coverage for DCI P3 color gamut. Digital Cinema has 2 Color Space: BT.709 or BT.2020

With MadVr, I use BT.709 3DLUT for SDR and DCI P3 3DLUT for HDR (with tone mapping HDR to SDR). MadVR has a setting (report 2020 to display, for NVIDIA GPU), that, if checked, report the correct color space to the projector.
So, for SDR movie the projector engages BT.709 color space and, for HDR, BT.2020. And all works as it should, without any manual input.

I'm trying to do the same with JRVR (that, by the way, is now at least on par with MadVr, in terms of image quality), using profiles.
I've built two 3DLUT profiles for JRVR in .cube format, with DisplayCAL: BT.709 3DLUT for SDR and DCI P3 3DLUT.

Using 3DLUT in JRVR, "screen Gamut" settings are disabled (you can choose any color gamut, but they do nothing), but if you change the "3DLUT Gamut (source color space)" settings, the relevant gamut is passed to the display. So, for HDR movies, if I choose BT.2020 3DLUT Gamut (source color space), BT.2020 setting is engaged by the VP and everything is visually correct (similar to MadVR)
Anyway, I don't know if this is the correct setting, as I built the 3DLUT in DCI.P3. But, if I choose DCI.P3 Gamut, the colors look wrong both in BT2020 or BT.709 projector settings
Any input apprecciated.

mattkhan:
if your projector expects 2020 then I would expect you to need to set screen gamut = 2020 but it's not clear whether jrvr supports this case (sending dci-p3 in a bt2020 container) so I think Hendrik has to comment on exactly how the source colourspace option is used & how it relates to the screen gamut, i.e. does it convert to screen gamut then apply a 3dlut on that or something else?

karmat63:
The problem is that, using 3DLUT as calibration method, screen gamut settings are actually disabled: changing screen gamut, does nothing, no change at all. I don't know if it is a bug or if it is how is designed to work; the "correct" color gamut is reported to the display only changing gamut inside 3DLUT settings ("3DLUT Gamut (source colorspace)"). But, as you say, we don't know how it works: does it convert DCI.P3 to 2020 or does it send DCI.P3 inside a 2020 container (the second option would be the proper one, as no display is actually capable of 2020 coverage).
Thanks for your input!

Hendrik:
When you use a 3DLUT, the 3DLUT controls the output color space, depending on the creation parameters of the 3DLUT itself. 3DLUT calibration tools should usually offer you a choice both for input and output colorspace for the 3DLUT (or output is measured with a meter).

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