I had to rerun the JVC Autrocal after 650 hours and I thought I'd update my findings in one post:
1) A Datacolor Elite isn't necessary and can be as good, as bad or worse as any Pro unit. The only difference is software, and as we don't need the Datacolor software, it really doesn't matter. If you get a bad pro (when checking with a more reliable, ideally reference meter and another software like Calman or CP), just send it back for a replacement and get another one until you get a good one. I tried to get an Elite and it measured worse than the Pro. So save your $$$. The latest JVC models need the Spyder 4 Pro. I don't think the Spyder 3 is compatible with the latest version of the software.
2) After you've installed the Datacolor software to get the drivers for the Spyder meter, make sure the Datacolor utility isn't loaded in memory, it interacts with the JVC software. You only need to install the Datacolor software for the drivers. You don't even need to activate the software. Also make sure you don't have any IP remote running on an iPhone/iPad/android like iRule, as it will interfere too. Make sure for example that iRule isn't loaded in any of the devices connected to the network.
3) Make sure that the environment settings in the JVC menus are disabled. The JVC Autocal doesn't work if they are enabled.
4) Once the JVC software is running, especially once you've entered the calibration section, only use the software to control the PJ. If you use the remote, the changes you make with the remote won't be taken into account by the software which will lead to issues.
1) Unless you only want to autocal one user mode with specific settings, I suggest you set the iris fully open in the JVC and when positioning the driver, make sure that you put it as close to the PJ as possible, without getting outside of the "safety rectangle" shown by the software before calibration.
1) If you want to create a custom gamut with the JVC software, for example a rec-709 one, or if using the filter on the higher models a DCI one, do so, load it into a custom gamut location, but note that this custom gamut can only be calibrated for color. Any gamma calibration will be ignored.
If you want to fully calibrate the projector, here is the process I recommend:
PHASE 1: Gamma calibration (and color calibration for first iris/CMD position):
0) In the settings, select gamma + color. Select how detailed you want the gamma calibration to be. I select High for 33 steps, as this only needs to be run ONCE.
1) Select a standard color profile, like standard or cinema, whichever you plan to use/want to calibrate. If you use user modes, this is the profile you will select in your user mode. But to calibrate, select it directly, don't select a user mode or a custom gamut.
2) Select gamma normal (all the gamma presets are calibrated, so better take the most standard one).
3) Select 6500K color temp (all the color temp presets are calibrated, so better select the most standard one).
4) Check that the iris is fully open (best position to calibrate gamma) and that CMD is off. Set filter to off as well unless you want to calibrate a DCI custom colour profile.
5) Run the calibration.
6) Once it's done, check that there is no - after either the gamma, color temp or gamut. This means this part of the calibration has been ignored and won't be corrected. Check that your gamma line is a straight line, that the color temp points are near D65. Gamut won't be properly corrected for most standard profiles, which is why you'll probably need to create a custom colour profile and calibrate it later. So you can ignore if gamut looks oversaturated. Most important at this stage is the gamma correction: the "after" line should be straight.
7) Save the calibration. Make sure that you save the backup file (with INIT in the name) in a safe place, as restoring that file is the only way to go back. A factory reset in the service menu Doesn't reverse the autocal changes. These changes are PERMANENT.
PHASE 2: Calibration of the various iris and CMD settings
Because the JVC Autocal only corrects one iris position range and CMD setting at a time, you need to either calibrate the settings you use, or be systematic and calibrate the whole range of AP value, with and without CMD if you use CMD.
0) Go to settings and deselect gamma. Gamma only needs to be run once.
1) Go back to calibrate, and as we selected iris fully open (0) and no CMD, go down the range without CMD and back up the range with CMD. The effective ranges are slightly different but I use 0, -5, -10 and -15 as they are easy to remember and cover all the positions that have to be calibrated. If you don't do that, when you change the iris settings the greyscale will be wrong.
2) As iris open (0) / no CMD was done in PHASE 1, I then select the following settings for Lens AP:
-5 and calibrate (the process is much faster as only colour is selected, it's the gamma that takes the longer, especially if 33 steps/high was selected). Then I save.
-10 (calibrate) (save)
-15 (calibrate) (save)
3) I then switch to CMD On, calibrate and save (without changing Lens AP)
4) Then I go back up the lens AP settings, keeping CMD On:
-10 (calibrate) (save)
PHASE 3: color calibration for custom color profiles
Once you've done this, you have calibrated the standard color profile you had selected (say standard or cinema) for all lens AP settings, with or without CMD, for all gamma presets and all color temp presets.
Also, user modes using this standard colour profile will be calibrated too.
So, if you select user 1 with standard, a custom gamma using the 2.4 preset and a custom color temp using the 7000K preset, it will be calibrated.
However, what you need to do is run a color only calibration, just once, for each standard or custom color profile you use.
I suggest you select the lens AP and CMD setting you are most likely to use for extra accuracy with these settings, but you only need to do this once.
For example, say you have created a rec709 custom color profile and uploaded it to custom1, you simply have to select custom1 as the color profile and run the calibration.
If, in a user2 preset, you select custom1 colour profile, gamma 2.6 and color temp 6500K, it should be calibrated already due to the previous steps.
From this baseline, I get near reference calibration for all my sources (all dEs under 2.8 with colorchecker SG, average dE under 1.5).
I use a BT1886 target gamma and only have to change the dark gamma control (2 notches) to get a near perfect BT1886 gamma curve.
If I then run a lightning LUT for MadVR with Calman, in 5-10 minutes (it only needs 105 points) I get a reference calibration for my HTPC with a max dE under 1.5 and an average dE under 1 for colorchecker SG. I double checked with a custom Colorchecker XXL with more than 1000 points and the whole cube is at reference level. With a 105 points / 5-10mn LUT, instead of the 17x17x17 (4913 points / 2-4 hours) that I needed with my old X30 to get results not as good.
I hope this helps. Please let me know if I got any of the former is wrong or if you experience a different behaviour, but that's what I observed when I redid my calibration.
The most important point is that trying to select a custom gamut would not allow to correct gamma. A standard color profile has to be selected for gamma to be corrected.
Last edited by Manni01; 12-11-2015 at 04:38 PM.