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HDR and projection

Re: HDR and projection
« Reply #15 on: January 08, 2017, 01:58:09 PM »
Panny UB900.


Gotcha. I think the 900+Integral does an excellent job with SDR 2020.

AVSCraig

Re: HDR and projection
« Reply #16 on: January 08, 2017, 03:23:52 PM »

Gotcha. I think the 900+Integral does an excellent job with SDR 2020.

The Magnificent Seven sure looked good on it last night in 4K.

Re: HDR and projection
« Reply #17 on: January 08, 2017, 07:35:19 PM »
Here is 3 HDR Smpte 2084 gamma measurements on a projector calibrated to 14fl, using a UB900 with different settings in the HDR converter, neutral -12 and +12  Its clear that the +12 setting pushes the gamma curve closer to the reference, but it also adds massive white clipping, just as adjusting contrast up on a projector..

This projector is calibrated to a 2.6 Bu ray SDR gamma, now i would imagine that if you do a Blu Ray SDR calibration to a 1.8 or something like that, and shoot 40fl on the scren you will be pretty close to the reference out of black with the converter in neutral setting.. Who have some gamma measurements from brighter projectors.?


Re: HDR and projection
« Reply #18 on: January 08, 2017, 07:36:07 PM »
-12 and +12

Re: HDR and projection
« Reply #19 on: January 09, 2017, 06:41:30 AM »

...
But the UHD standard was also delivered with actual specifications on how to do this conversion, unlike converting to SDR with 2020.
...

Very interesting. Was this in the form of equations? Have you seen what was this entails? 

Thanks for the info.

Re: HDR and projection
« Reply #20 on: January 09, 2017, 05:23:03 PM »
Here is some stuff to read about UHD HDR WCG calibration.

http://files.spectracal.com/Documents/White%20Papers/HDR_Demystified.pdf

Re: HDR and projection
« Reply #21 on: January 09, 2017, 05:33:55 PM »
Kris should the new JVC models improve this in any way?

AVSCraig

Re: HDR and projection
« Reply #22 on: January 09, 2017, 06:26:48 PM »
Here is some stuff to read about UHD HDR WCG calibration.

http://files.spectracal.com/Documents/White%20Papers/HDR_Demystified.pdf

Good information in there - thanks !

AVSCraig

Re: HDR and projection
« Reply #23 on: January 09, 2017, 06:32:34 PM »
Kris should the new JVC models improve this in any way?

Not Kris, but the new JVC models really only have two changes over the current models - low latency ( " gaming " ) mode, and auto HDR plus HLG. But with numerous user mode settings, you can set one up for no HDR and having it map down to standard gamma and REC709 per Kris's suggestion. 

Re: HDR and projection
« Reply #24 on: January 09, 2017, 07:12:15 PM »
That PDF is neat. At the end it explained the Technicolor HDR which is added to LG OLEDs this year.

Re: HDR and projection
« Reply #25 on: January 09, 2017, 09:19:15 PM »
Not Kris, but the new JVC models really only have two changes over the current models - low latency ( " gaming " ) mode, and auto HDR plus HLG. But with numerous user mode settings, you can set one up for no HDR and having it map down to standard gamma and REC709 per Kris's suggestion.

Ah ok, so the new hdr mode doesn't help the projector correctly map hdr levels?

And do I have to do a captcha every time I post in this forum? So far it's two for two...

AVSMike

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Re: HDR and projection
« Reply #26 on: January 10, 2017, 08:35:14 AM »
Ah ok, so the new hdr mode doesn't help the projector correctly map hdr levels?

And do I have to do a captcha every time I post in this forum? So far it's two for two...

Only for the first few posts. I have approved your first two.
My Baffle Wall System: https://discuss.avscience.com/index.php?topic=124.msg902#msg902

Mike Garrett
AV Science Sales
585-671-2968
mike@avscience.com

JVC, Sony, Epson, Marantz, Denon, Yamaha, Stewart, Seymour, Screen Innovations, Screen Excellence, DNP, Da-Lite, Triad, SVS, Martin Logan & more.

AVSCraig

Re: HDR and projection
« Reply #27 on: January 10, 2017, 12:03:08 PM »
Ah ok, so the new hdr mode doesn't help the projector correctly map hdr levels?

And do I have to do a captcha every time I post in this forum? So far it's two for two...

Hard to say until someone gets one and tests it. I'm guessing that it will still need some settings adjusted based on your screen size etc.

AVSMike

  • *****
  • 2010
Re: HDR and projection
« Reply #28 on: January 12, 2017, 01:46:08 PM »
Ah ok, so the new hdr mode doesn't help the projector correctly map hdr levels?

And do I have to do a captcha every time I post in this forum? So far it's two for two...

Not after a few posts. I think after three have been approved it stops. I approved your earlier posts.
My Baffle Wall System: https://discuss.avscience.com/index.php?topic=124.msg902#msg902

Mike Garrett
AV Science Sales
585-671-2968
mike@avscience.com

JVC, Sony, Epson, Marantz, Denon, Yamaha, Stewart, Seymour, Screen Innovations, Screen Excellence, DNP, Da-Lite, Triad, SVS, Martin Logan & more.

Re: HDR and projection
« Reply #29 on: January 15, 2017, 03:53:19 PM »
Hey Everyone. Just thought I'd chime in with some thoughts and experiments I've been running the last few days. As all are more than aware of here HDR on projection is sort of a work in progress right now. I haven't had the chance to play with HDR with the newer Sony offerings since they've revamped with firmware, so most of these comments are based on my time with the JVC X750. Initially most were using JVC's recommended settings and then going from there using a fleeting amount of test patterns that are available to dial in a picture that looks good. The problem there is while it may look good, it is still a best guess approach at this point derived mainly from trial and error with other's settings or successes. The next step was converting the HDR output to a SDR output but retaining the WCG capacity of the video signal. This seems to work best with the Panasonic player at the moment, but even after many weeks of trial and error I still see issues with gamma, mild clipping and more with this solution. Since the WCG portion of the movie is mastered in relation to the HDR EOTF, I imagine we are still seeing an improper conversion down to SDR levels as you would have to take into account the change in color volume from the intended display luminance. Sure it can look good still, but I would almost argue that the same look could be obtained with standard Blu-ray by just using a wider color preset on the projector. Call me a video snob but I prefer accurate to intent images rather than images that just look good.

So I decided to try something that no one ever seems to consider or try, telling the player NO for HDR and having it map down to standard gamma and REC709 color. This still preserves the resolution bump offered by UHD and the 10-bit video. But the UHD standard was also delivered with actual specifications on how to do this conversion, unlike converting to SDR with 2020. Using this method I get a proper conversion for both gamma and color to SDR, and can view the movie with a proper calibration. I have to say, so far I'm far more impressed with this as the image never has that "it looks great, but there are a few things that still look off". Like everyone else I am hoping that solutions will come that deliver an ACCURATE fold down to SDR with 2020 color, but it appears we are not there yet. I am also anxious to see what can be achieved with a Radiance Pro that tone maps HDR down to the projector's true output in what appears to be a much more intelligent fashion. Until then, I think I'm going to stick with this (other than continuing experimentation with the other options for testing purposes) for now and just sit back and enjoy.

This is the same way I have been doing it from the start as it gives the best and most accurate picture and it is important to me. :)
« Last Edit: January 15, 2017, 05:36:33 PM by Andreas21 »
Regards
Andreas                                                           

Calibration software: Lightspace and Calman. TPG: Murideo Fresco SIX-G
Meters: Klein K-10 A and Jeti 1501. THX II certified.

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