You can't use the Spyder 5 with the JVC Autocal to get peak luminance, but you can can use it with another calibration software supporting it (HCFR, ArgyllCMS, Calman, Chromapure, Lightspace) to get a good approximation of peakY. A light meter will be more precise if it's a good one, such as the Minolta T10. Others will also vary in accuracy. If it's only to evaluate peakY, I would use the Spyder 5 aiming at the screen (to take gain into account) with a free (or paid ofr if you already have one) software.
Originally Posted by IMDave
You are probably correct there. It was discussed earlier in the thread, but JVC only have a history of "fixing issues" in firmware, not introducing new features.
As there is a new series, there is little likelihood of JVC doing much with regard to firmware with the 2015/2016 series.
That is why Arve's tool has been welcomed as "The Saviour". Without it we would be been stuck with Gamma D and HDR would have been a lost cause for us.
Originally Posted by nathan_h
Arve's tool is awesome and I use it with the speed guide (links in my sig) but the real breakthrough began when Manni figured out how to load a custom curve using the JVC autocal tool. It took longer, and had fewer control points and options, but with effort and time, it achieved 90% of the Arve tool.
Either way, between the two of them, they have taken what was an untenable situation with HDR and given us a lot of life out of these projectors, which is AWESOME -- because while JVC has provided a good default HDR curve in the next generation, our generation was /is apparently never going to get that fix, even though it truly is a bug or broken versus just about every other commercial HDR offering out there.
Originally Posted by IMDave
Thanks Nathan. You are correct. Manni's work certainly pioneered the way, and we wouldn't be where we are without his efforts. I'm not sure whether Arve was already developing his python app independently at the time. Bit of a "chicken and egg" scenario. Using the AutoCal software was a stroke of genius on both their parts, and actually reflects poorly on JVC for not doing something similar for their own product.
Thanks guys, it's only has a limited interest but for the record here is the history (as I remember it!):
- I had been bugging Spectracal to give us HDR suppport for projectors for a long time, but nothing was coming as there was no standard for the EOTF for projectors, so we were stuck with SDR BT2020 using the Integral, at least with the Pana UB900, as Gamma D had too many limitations.
- A Calman user called
posted a really good idea to use a multiplier in Calman to be able to display the measurements in a meaningful way. He was using meter profiling to do this, which was complex and had limitations.
and I started picking up on his idea at about the same time. This was in the Spectracal forums http://www.spectracal.com/forum/view...hp?f=92&t=6122
- I came up with the idea of using the screen multiplier instead of profiling. This made things much simpler and both Chad B and myself obtained very good results with manual HDR calibrations.
- I started sharing a few of my custom gamma calibrations using the export feature of the JVC Autocal in the owners's thread, to allow others users with a similar set-up to get better results than with Gamma D. At the time it took around 30 minute for each manual calibration, which made it difficult to issue calibrations for others than those with a similar set-up as mine.
saw this early work and posted about his tool in the owners thread. I downloaded it and immediately saw the potential, as it allowed to achieve in a few minutes what took 30 minutes manually. Plus it offered lots of options that a manual calibration didn't offer, as well as a better resolution (33 point instead of 21), which makes a difference to shape the main control points of the curve accurately. I am convinced that Arve had already started developping his tool a while ago, but we just didn't know about it. Otherwise we wouldn't have wasted hundreds of hours doing manual calibrations! Arve has since developped his tool further and has implemented many suggestions offered here. I stopped doing manual HDR calibrations (except for verification and fine-tuning purposes) as soon as I first used Arve's tool, and suggested right away that people use it to create their own curves instead of downloading mine. It was really a game changer. I and others posted parameters for their curves, and I exported a few using the JVC Autocal to share with the community, as it was now easier and faster to create curves that would work well in different set-ups. I created and shared a Dolby Vision Emulation curve using the same peakY as Dolby Cinema (106nits) so that those who didn't want to create their own custom curve, or who had a similar peakY, could get accurate results by setting peakY close to 106nits and using that curve.
- We were left with two main limitations: JVC forced Gamma D whenever HDR content was detected, which meant we had to reselect our custom gamma curve every time we pressed play or resume, and the dynamic iris was disabled when playing HDR.
and I had the same idea at about the same time: what if the HD Fury Integral could fool the JVC into thinking it was still receiving SDR? I explained the issue to
(I beta test for them), asked them to develop a solution, and helped them to implement it in the Linker (it wasn't possible in the Integral due to hardware limitations). In just a few days, they delivered the option to disable HDR in the linker in order to fool the projector into thinking it was getting SDR, so that we could keep our custom Gamma at all time and enable the dynamic iris in HDR if we wanted to. That gave us BETTER than the new models, as they still can't use the DI with HDR content, even if their implementation of HDR is better out of the box than Gamma D (but not better than a custom gamma curve).
- I had to go back to work so I left it to others to pick up the mantle and explain how it all worked to newcomers.
(Ric), who had a limited peak brightness (under 50nits) but was determined to get HDR in his set-up rather than SDR BT2020, came up with a quick guide to use the auto set-up feature of Arve's tool which really helped those with similar low brightness or those who wanted a more automated way to end up with a good curve.
- All along, others such as
and others posted screenshots, parameters, advice, guides helping to share the knowledge and progress the research and development.
All the relevant links, including download to Arve's tool, were added to the first post of this thread.
This community effort happened very quickly (mostly in the owners thread starting here
), over a few weeks, but it gave our models the ability to display as good or better HDR than more recent models, giving them a second lease of life. I certainly put many hours into this because I had been looking for better than gamma D HDR for a long time (like others I had been using SDR BT2020 up to that point), but I'm convinced that
would have posted about his tool at some point or the other, and that users like
would have come up with the idea of using the Integral to get rid of Gamma D and get the DI back. We were all figuring it out at the same time and feedback from others helped a lot. It was really a joint effort. So I might have contributed to make it happen a bit faster and to share the fruits of this effort, but I don't think I have invented anything (unlike
who has created a wonderful piece of software and is generously sharing it with others).
To me it illustrates the great things (well, it sure is a first world problem, but you know what I mean) we can accomplish with a community like this. I learnt most of what I know about projectors and calibration in this forum from current and past users, so I'm happy to be able to give something back to the community when I can. That makes up (partially) for the time when I annoy everyone.