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JVC Autocal using ColourSpace Remote Control

 
 
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Author Steve

INF
Male
#16 | Posted: 21 Jun 2021 11:00 
Peter, looks great!

Steve
Steve Shaw
Mob Boss at Light Illusion

Author Steve

INF
Male
#17 | Posted: 10 Jul 2021 11:39 
Some end user feedback:

"I picked up my N7 Wednesday, and was delighted to see .dll files available for linking AutoCal and ColourSpace, allowing the use of an ID3Pro.

I performed a check on the N7 OoTB calibration (very good actually), and today downloaded the JVC SW, and followed the EXCELLENT set of instructions from @OMARDRIS to link to ColourSpace.

I was a bit wary, as I wanted my N7 factory settings file before starting (seems strange I had to commit to a change without my back up!).

But fear not, it all went well - which Ted will atest from my ColourSpace learning curve is a first. I rechecked the calibration - which showed much improved calibration over OoTB settings.

I no longer have a Lumagen in my system for 3Dlut - so I thought my use of ColourSpace was going to be limited from this point forward, BIG Thanks to all those involved."


Steve
Steve Shaw
Mob Boss at Light Illusion

Author Grabthars Hammer
ZRO
Male
#18 | Posted: 24 Jul 2021 11:16 
Hi guys,

i tried this awesome workaround to perform an Autocal with an Xrite i1pro plus on an JVC X5000.

After the Autocal process I get an horrible wrong gamma curve which look like an rollercoaster. Not sure if this is maybe an issue with the "unsupported" plus probe.

Author Omardris
ZRO
#19 | Posted: 24 Jul 2021 12:43 
Unfortunately, something must have gone wrong.
Have you ever done a grayscale measurement with ColourSpace ZRO and the Display Pro plus before using JVC AutoCal?
The Display Pro (EODIS3) must always be aligned towards the screen and the diffuser must not be folded in front of the lens. At the same time, you have to make sure that the sensor does not measure its own shadow on the screen.
Many JVC users zoom out the image on the screen to get more light for the measurement.
In the first post, Steve placed a link to the AVS forum where there are many tips on JVC AutoCal and the EODIS3.
Peter

Author Grabthars Hammer
ZRO
Male
#20 | Posted: 24 Jul 2021 14:39 
Hmmm.....

Must be aligned to the screen? Are you sure?

The general Autocal process places the spider sensor in the direction of the Beamer (direct measurement), not to the Screen (reflective). However, if I would do that the measure can not be right. I am using a react 3.0 (Thor tab tension by euroscreen).

I calibrated the Projector two days ago (colorspace htl with the awesome pgenerator and integrated teds iso) with a nearly perfect result in gamma and grayscale (bulb has >2000H). So of course I can try again.

Author Steve

INF
Male
#21 | Posted: 24 Jul 2021 15:05 
All projector calibration should be off the screen, as the screen always has an effect on the image/colour.

Steve
Steve Shaw
Mob Boss at Light Illusion

Author Grabthars Hammer
ZRO
Male
#22 | Posted: 24 Jul 2021 15:13 | Edited by: Grabthars Hammer 
Yes, indeed.

I am talking about the JVC Autocal calibration which is performed and described by Peter Hess (JVC). The Software also told you to Autocal with the (spider) sensor facing the projector.

https://de.jvc.com/files/images/_web/8/DE/Projektor/Erstellen_eigener_Gammakurven.pdf

http://www.heimkino-vorfuehrung.de/HDR-Tuning/Workshop_zur_JVC-AutoKalibrierung.pdf

A normal calibration of course is reflective from the screen. All other procedures makes no sense.

Author Omardris
ZRO
#23 | Posted: 24 Jul 2021 16:37 | Edited by: Omardris 
Hi,
JVC's instruction to align the sensor towards the projector only applies to the Spyder5 because this sensor has a special grating in front of the optics.
With the SpyderX and Xrite i1Pro2 spectrometer, the alignment is towards the screen, according to JVC.
When measuring with ColourSpace, the EODIS3 must absolutely be aligned towards the screen.
But you can use ColourSpace's intelligent integration time control to improve the measurement result in the dark area. See here in the forum also Ted's notes about the recommended settings.
Peter

Author Grabthars Hammer
ZRO
Male
#24 | Posted: 24 Jul 2021 16:47 | Edited by: Grabthars Hammer 
Hi Peter,

thanks for the explanation!

But there is still the question how it is possible that the gamma curve is correct measured and calculated if you measure from screen?

For example, I have to set gamma to 2.6 (projector) to match the gamma 2.2 curve (while calibration) because of the screen is gray/high contrast. So is there a compensation in the Meter or JVC Software? Otherwise the gamma would go wrong.

Sorry maybe this is a stupid question.

Author Grabthars Hammer
ZRO
Male
#25 | Posted: 24 Jul 2021 17:00 
Ok Peter,

now you got me.

I prepared my setup, after the proki finished heat up, I will perform an measurement.

Author Omardris
ZRO
#26 | Posted: 24 Jul 2021 17:10 
There are no stupid questions, but often stupid answers.
The gamma measurement does not depend on the absolute measured values, but only on the ratio of the gray levels to 100% white.
The screen has no influence on this.
In contrast, the measurement in the direction of the projector lens is critical for the EODIS3 because there is a risk that the sensor is overdriven with far too much light.
Peter

Author ConnecTED
LTE
#27 | Posted: 24 Jul 2021 20:20 
Hi Grabthars,

It's better to aim the meters to your projector screen.

Please see the ideal meter placement here:

https://www.avsforum.com/threads/colourspace-cms-next-generation-calibration-thread.3049142/post-60350490

(click to expand)

Author Grabthars Hammer
ZRO
Male
#28 | Posted: 25 Jul 2021 08:57 | Edited by: Grabthars Hammer 
I have taken the measurement and can confirm that it works exactly as you described. The result was a uniform linear gamma distribution.

Thanks to you too Ted, this is exactly what I was looking for. You guys are a great bunch and I am glad I switched from Calman.

cheers

Marc

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