One other item I noticed, which is very similar to Sony units of the past. Previous Sony units like the 1100ES and the other smaller 4K units, have had issues where the Blue panel was out of convergence for the first 15 mins or so, then it would settle in. I am seeing this exact same thing on the JVC. This might also improve over time, but if not at least it seems to settle into place as the unit warms up.
One of the things that struck me on first starting up mine was there was no convergence errors at all, nor after some hours of use. My Sony 1000 was -8 out on blue and converged a little as the projector warmed up. The Z1 seems stable. Maybe I struck lucky with mine.One issue that seems to affect my Z1, as it did my Sony, is that focus seems to drift between sessions, so I shut the unit down with focus spot on, but the projector then starts with focus off. I then have to check focus each time I start and refocus if necessary. I had hoped to say goodbye to that particular problem.
I will check for that. Maybe focus changes after it warms up ?
With the RS4500, I tried the HDR preset, and I also tried BT.2020, which on my sized screen(s) is do-able. I've come to the conclusion that Kris Deering's suggestion to watch 4K Blu Rays using Rec. 709 just looks more natural. You still get the added detail and clean noise free picture thanks to 4K, and Rec 709 using the natural preset is brighter.
How exactly are you handling this? Are you having the UHD BD player send UHD HDR REC2020 to the projector and just putting the JVC in it's REC709 preset mode? Or are you having the color points truncated from REC2020 to REC709?
I'm almost certain he is just outputting SDR REC709 from the Bluray player, since there is an exact specification for how the players convert HDR2020 to SDR709.
I talked to someone at Oppo about this and learned while converting HDR2020 to SDR709 is in the UHD BD spec, it's still complicated. I discussed with them how the BD and UHD BD even at rec 709 still have different looking gammas (at least on the Oppo) on several movies I closely compared (running the BD in the 103D and UHD BD in the 203 into different inputs A/Bing the scenes at the same time essentially on my RS500). I see shadow detail crushed and color still a little off at times on the UHD BD at SDR709. Sometimes a little too much contrast probably from the gamma conversion. Basically I was told that a conversion curve is needed to match all the values from an HDR signal into the SDR range. In theory, the player has the potential to restore the same gamma as the BD, however there isn't a "perfect" algorithm for converting an absolute luminance into the relative luminance yet. So there is going to be some variance and probably some tweaks to optimize this.
On my RS4500 I'm seeing more shadow detail for sure than on my RS600.
I'd be inclined to say this is a calibration issue... with proper calibration, especially a 3D LUT, both should display the same shadow detail.
I had some black crush on the RS600 - no doubt.
1775 Replies
597430 Views