Originally Posted by Kris Deering
That is why I find it so odd. If I hook an Oppo up to the JVC and look at brightness and contrast (both at 0) in the HDMI Standard mode, the projector is clipping right at 234. If I lower contrast by one click it is at 235. Black is clipping at digital 18. If I don't touch anything (leave these at 0) and do a cube calibration with the Lumagen 2021 and then recheck my clip points, white is now clipping at digital 240. So somewhere in that process the JVC somehow starts showing above 235 despite being in standard mode (which I was under the impression was impossible). I agree with you about losing contrast and peak brightness using Super White. I'm just trying to figure out why I'm seeing 240 after a calibration in Standard mode when that shouldn't even be possible.
It's not the JVC, it's Calman autocal that does this, because it used to assume you were using superwhite, given that this is the generic THX recommendation (to resolve up to 255). I had a long and ongoing discussion about this with Joel and the Spectracal team, and Calman now has an option specifically for the JVCs (and other displays where calibrating in standard can be preferable to preserve brightness and on/off).
Because it's mostly applicable for displays (like the JVCs) which don't have much brightness to spare, and therefore privileges peak brightness over absolute accuracy, it's not the default. When you run the cube, in the cube options in the pop-up window (not the workflow or software options), you have to click on "advanced options" and specifically uncheck "balance luminance". While it sounds scary, it doesn't mean luminance is not corrected. It only means that Calman will not "force" superwhite levels to be able to fully balance luminance if some points are deficient. I always run autocal doing this (not saved, so needs to be specified every time), and when I check the 125 points of the cube the max dE is below 3 and the average is at 1.5, so that's good enough to me if it save my on/off and peak brightness.
Here is a before/after (colorchecker and linearity) of my last calibration. Please note that Cyan at 100% sat (like all the points between blue and green at 100% sat) is not correctable on my unit due to a wonky hue for green (a common minor issue on many units, mostly invisible after a good 3D LUT calibration). Otherwise, the results would be even better.
Before (all measurements made with my Discus trained to my i1pro2):
As you can see, no real ill effect (by this I mean, visible) unchecking this balance luminance option for the JVCs. It's only an issue for those obsessed with the smallest dE numbers, at the expense of the best picture quality. The error in Cyran at 100% is slightly visible, but that's not Calman's or the Radiance's fault, as it's uncorrectable in the native gamut (all profiles tested of course, standard remains the best starting point for me).
I tried with the balance luminance checked (default) and while some the dEs go very slightly down (in a way which isn't visible as all dEs are under 3 anyway), the on/off and peak brightness go significantly down, which leads to a dimmer picture, with less depth. So unchecking balance luminance is the mode I would recommend for the JVCs. At least I would suggest everyone tries it to see if the picture looks better or worse.
If your primaries have a slightly deficient luminance to start with, you might want to raise a bit the color control (in the JVC) to raise luminance as close to the target as possible before the autocal, and that way make sure not balancing luminance doesn't give too much error, but as you can see results are excellent.
You might also want to try, after calibration, the trick of raising very slightly IRE0 in the Radiance gamma controls to resolve 17.
Please let us know if this helps once you've tried. For me, having both the excellent accuracy of the cube calibration AND max peak brightness and on/off gave the best picture I had seen on my rs45. Accurate colours, with a great picture depth (I'm targeting BT1886). Hopefully you'll like it too.Edited by Manni01 - 1/6/14 at 8:07am