NEC 2690 SVR Calibration using i1Pro & i1 Display2

[issa]

Hi all

I calibrated and profiled my  NEC 2690 Spectraview using basICColor Spectraview profiler and i1Pro, I used the hardware calibration settings in the software with settings, D65, Brightness 140 cdm2, L* and minimum neutral black.  Calibration and profiling works fine and on re-validation I get very small delta. Even if run this a week late i get 0.3 delta, very happy.

I have since did a validation using a i1 Display2, as I have told, may be better for monitor profiling, however White balance comes in @ 7000, Brightness @150, and I get bigger delta on colour, but not neutral colours, Delta @1.5

Is that normal to have this kind of variations between these devices, which one is more accurate and should I worry about this.

I have borrowed an other i1Pro UV-Cut from a friend of mine, and i get similar results to i1pro profiling, so the two i1pros, get similar results. Is that due to the higher quality in the manufacturing?

Would appreciate your experience / feedback, happy to provide/upload screen delta validation shots.

Thanks
Issa

[shayaweiss]

I have since did a validation using a i1 Display2

From my understanding, a regular i1D2 is lacking the matrix filter necessary for wide gamut monitors. To use a colorimeter with the European SpectraView software, which is based on BasICColor Display 4 and as such apparently lacking a matrix filter, you would need a custom mated i1d2 from NEC, namely their own sensor. That way, a colorimeter with a corrective filter, should give better results than a spectrometer.

You'll find a lengthier reply to your question in a recent post http://luminous-landscape.com/forum/index....st&p=372083

[digitaldog]

I have since did a validation using a i1 Display2, as I have told, may be better for monitor profiling, however White balance comes in @ 7000, Brightness @150, and I get bigger delta on colour, but not neutral colours, Delta @1.5

The numbers (for white point and the deltaE report) are meaningless really. As for White Balance, use whatever value produces a screen to print match. As for the report, its a feel good button that would only be really useful if the values were very high, indicating some issue like the puck falling off during calibration or something along those lines. A custom filter matrix is preferable but the bottom line is, get a match, the values that produce that match don’t mean much in the end.

[issa]

The numbers (for white point and the deltaE report) are meaningless really. As for White Balance, use whatever value produces a screen to print match. As for the report, its a feel good button that would only be really useful if the values were very high, indicating some issue like the puck falling off during calibration or something along those lines. A custom filter matrix is preferable but the bottom line is, get a match, the values that produce that match don’t mean much in the end.

Thanks Andrew - it looks the i1pro might be a better suited to this monitor, thuis saving on filter matrix Pug.  Will perform a print test on both and evaluate the output.

Thanks issa

[terrywyse]

I calibrated and profiled my  NEC 2690 Spectraview using basICColor Spectraview profiler and i1Pro, I used the hardware calibration settings in the software with settings, D65, Brightness 140 cdm2, L* and minimum neutral black.  Calibration and profiling works fine and on re-validation I get very small delta. Even if run this a week late i get 0.3 delta, very happy.

I have since did a validation using a i1 Display2, as I have told, may be better for monitor profiling, however White balance comes in @ 7000, Brightness @150, and I get bigger delta on colour, but not neutral colours, Delta @1.5

Is that normal to have this kind of variations between these devices, which one is more accurate and should I worry about this.

First off, those delta E numbers in no way represent the display's or the display profile's *accuracy*, it simply represents more of a "consistency" measurement between what the profile *predicts* the display should measure and what it *actually* measures...using the same instrument of course. Like Andrew pointed out, it's more of a predictor if anything went wrong during the calibration/profiling stage. It would be a stretch to say that low delta E numbers represent anything in terms of actual display accuracy, especially if by "accuracy" you mean this will translate into a better display-to-print match.

As far as the higher delta numbers with the i1D2, if you didn't reprofile it with the i1D2, one would expect the values to be higher since you calibrated/profiled with one instrument but verified with, not only a different instrument, but with instruments that are completely different than each other (spectrophotometer vs. colorimeter).

As far as the difference between the two i1Pros, I would expect them to agree with each other, different filtration notwithstanding, because they are essentially identical instruments in terms of optical deisgn and measurement technology, not necessarily because they are "higher quality". Having said that, one could infer that a $1,000 instrument is going to be built to better manufacturing tolerances than a $100 instrument. I personally trust my display calibration/profiling to an i1Pro spectro as opposed to any of the number of colorimeters that are out there. With a spectro, the whole "custom filter matrix" issue is moot plus, I think it would be reasonable to assume that you might get a better display-to-print match if the i1Pro is being used for *both* display and print profiling. The one area where spectros don't do so well with displays is in the extreme shadow end where they tend to lose sensitivity compared to a colorimeter. I think this has to do with the fact that a slow colorimeter is perfectly happy to wait all day until enough "black photons" get registered on it's sensors while the spectro is not so patient and sez "I've get better things to do than wait around all day for a few black photons to register". Yes, I think that's the technical explanation.

Regards,
Terry

[Steve Weldon]

The numbers (for white point and the deltaE report) are meaningless really. As for White Balance, use whatever value produces a screen to print match. As for the report, its a feel good button that would only be really useful if the values were very high, indicating some issue like the puck falling off during calibration or something along those lines. A custom filter matrix is preferable but the bottom line is, get a match, the values that produce that match don’t mean much in the end.

This has probably been asked to death.. but it would be nice to clear it up.

I'm running two very recent LCD2690Wuxi2's.. Using SVII, and a i1d2 colorimeter that's listed in the manual of both the monitor and software as "compatible."  These monitors were purchased in Thailand from NEC Thailand but came straight from the factory in China I'm told.  They were special order items and took months to arrive.

My questions:

1.  Are these different from Euro or American spec samples and if so how are they different?  Are are the Asian models different than both?

2.  I purchased SVII on the NEC site..  It works, they calibrate, I get matching monitors, everything looks great.. so I'd always assumed I had the American spec series monitors.. but assuming.. well..

3.  I used to print all my own prints but lately (last 4-5 years) the print houses are so cheap.. it's just not worth it to print my own if I can find a decent printer outside.  So.. my needs are basically to profile these monitors to sRGB Emulation.. which so far is appears to be working great.  I see it in LR or CS5, put it on my site, and it looks the same in my browser as it did in LR/CS5.. first time this was ever that accurate and I attribute it to the sRGB emulation.  So, considering this.. is there a different hardware device that would provide more accurate colors within the sRGB gamut.  I have also profiled for  5000/2/100 wide gamut and 6500/2.2/140 wide gamut.. and these work great with my in house Epson printers and on specialty print house I work with who has 7000/9000 Epsons..  

Well hell, for the first time ever I'm having my cake and ice cream too.. but I keep hearing about all these different hardware pucks and Euro version monitors..

And.. as far as I can tell it matches my xrite color checker perfectly.. shade for shade..

I'm probably being silly but.. would really like to understand the different versions of all this..

[ErikKaffehr]

Hi,

You are learning fast, and thanks for sharing your experience. Feel awfully sorry for you having a bad experience, but I got the impression that your problems are by large solved? Nice to hear!

And yes, I think that colorimeters vs. wide gamut displays are probably problematic, unless you use a colorimeter built for your display.

Best regards
Erik

From my understanding, a regular i1D2 is lacking the matrix filter necessary for wide gamut monitors. To use a colorimeter with the European SpectraView software, which is based on BasICColor Display 4 and as such apparently lacking a matrix filter, you would need a custom mated i1d2 from NEC, namely their own sensor. That way, a colorimeter with a corrective filter, should give better results than a spectrometer.

You'll find a lengthier reply to your question in a recent post http://luminous-landscape.com/forum/index....st&p=372083