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Colour Calibration for JVC DLA X70R

 
 
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Author christherodgers
ZRO
#31 | Posted: 2 Jun 2013 21:15 
Well, what can I say, it seems that we have differing experiences.
As for the screen, I'm not seeing lifted blacks, not in comparison to the Sony CRT I have in the room anyway. The high gain screen is really our only option given that in most cases (broadcast work) we're matching to that display. I'm aware of the hot-spot issue with high-gain screens, but it's not something I'm seeing - perhaps something to do with the size of our screen and the throw.
For the P3 profile, you are right that we're unable to hit the target at the lower end of the scale, but really only right at the very bottom, and it was barely noticeable to the eye (well, my eye anyway).
The primaries covered P3, although I don't think the secondaries were verified. To clarify, I wasn't the one personally carrying out the calibration - I was just an interested observer.
These calibrations are working as Truelight 'Profiles' rather than cubes per se.
Chris

Author Harry
ZRO
#32 | Posted: 2 Jun 2013 21:25 
I now have a X75 and can also say, calibrating the grayscale/gamut isn't the problem (using a video processor like the Radiance).

Unfortunately I have (had) some other trouble. My former JVC (X70) was pulsing in high lamp mode + using CMD. Got told from service, that's no failure, can't be solved.

My replacement-X75 (not for free!) has a terrible native convergence; red+blue starts shifting from the screens center till the right / downside borders. At the end red is >1 pixel off. And every time after power on the lamp flickers slightly for 1,5h ... 2h, until it becomes maximum operation temperature.

For the last point I'll go in contact with the service. For the first point all JVC users have to live with, because JVC's are equipped with a digital pixel adjustment to "correct" convergence issues (but not w/o side effects ).

I really don't know, if my next PJ again is a JVC. Too much qualtiy issues. But to be honest - the nativ contrast ratio and nativ "black" is great, and this w/o dynamic iris aperture. Also the native sharpness (despite of the convergence) is very good all over the screen.

(Sorry for that short off-topic)

Author Steve

INF
Male
#33 | Posted: 2 Jun 2013 21:26 
Yeah, you need to run a cube profile - that verifies all colours, not just the peak primaries.
A quick check can be done with LightSpace a running a Quick Profile, with secondaries selected.
That will very quickly prove the real display capabilities.

And it sounds like your CRT has poorly set Bias values - the black really should be darker than a gain screen - by some margin.

Steve
Steve Shaw
Mob Boss at Light Illusion

Author christherodgers
ZRO
#34 | Posted: 2 Jun 2013 21:44 
Hi Steve,
I've have no reason to suspect a problem with either the CRT or projector calibration. Both were carried out by people who I have complete trust in. Now, that's not to say that I haven't found plenty of other issues with the projector, but calibration hasn't been one of them. As Harry said, I'd look into alternatives in the future, but not for the reasons you stated.
Chris

Author Steve

INF
Male
#35 | Posted: 2 Jun 2013 21:55 
If it's working, and is accurate, that's all that matters.

We've just had so many customers reject them as not being fit for purpose... most call us in to verify their own findings, rather than us fail the projectors when they were happy.

If yours is good, then all's fine.



However, I would still recommend running at least a Quick Profile to verify all is ok.

Steve
Steve Shaw
Mob Boss at Light Illusion

Author Steve

INF
Male
#36 | Posted: 9 Jun 2013 09:06 
Chris, did you ever run a cube profile on the display?
Would love to see what the displays is really like.

Steve
Steve Shaw
Mob Boss at Light Illusion

Author christherodgers
ZRO
#37 | Posted: 9 Jun 2013 10:30 
Hi Steve,
I hope to profile the projector again this week when our replacement unit arrives (like I say, we've had issues with the projector). This will be carried out by Filmlight using a Truelight probe so I don't know how to share the results, but I'll report back on how it goes if you like.
Chris

Author Steve

INF
Male
#38 | Posted: 10 Jun 2013 08:06 
Hi Chris, that's perfect - if you can send us the profile we can have a look at them - we can work with just about any system profile data.

We can also supply a 3 day evaluation license for LightSpace, if you want to do your own profile check, and have access to a compatible probe

Steve
Steve Shaw
Mob Boss at Light Illusion

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