Colormunki Display vs i1 Display pro

[DarKHawK]

Hi,

I seem to have made the other thread in the wrong forum, so I’m making a new one here. Please delete the other one.

I’ve purchased a used Colormunki Display to use as a calibrator for my screens. My aim basically is to use it to match my multi monitor setup for white point, color temperature and luminosity.
When comparing the results of the initial white point setting between that Colormunki Display and my friend’s i1 Display pro “Shows as i1 Display3 in the settings menu” there is a difference between the two as shown in the following screenshots:
Is there something I’m doing wrong, or some setting that need to be adjusted between the two devices?

Thanks

Monitor 1: Colormunki

i1 Display Pro

Monitor 2: Colormunki

i1 Display Pro

Calibrite Display Pro HL on Amazon  
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[Vincent]

First of all inter instrument agreement (under certain tolerances due to price constraints < X dE) applies only if using the proper spectral correction for that display on both devices.

Second, if you wish to make comparisons, use dE vs some reference instead of visual daylight distance to closest daylight white.

[DarKHawK]

Thank you for the reply Vincent.

Correction was set to auto and used a Spectral file from the database for that specific monitor.

Second, if you wish to make comparisons, use dE vs some reference instead of visual daylight distance to closest daylight white.

Sorry for the dumb question: How do I do that. What reference should I use?
Let me rephrase my question:

Does those variations in instruments acceptable/known?

And is the difference between those two instruments big/huge that would mean one of them can be considered defective/unusable?

Reason for asking is that I found this comparison between the same two models and there is almost no difference:

https://www.youtube.com/watch?v=s2yFUXueH50

[Vincent]

Thank you for the reply Vincent.

Correction was set to auto and used a Spectral file from the database for that specific monitor.

Which one? resolution? it’s native or smaller gamut simulation? display model?
It must be a CCSS file. CCMX are not portable between i1d3 devices

Second, if you wish to make comparisons, use dE vs some reference instead of visual daylight distance to closest daylight white.

Sorry for the dumb question: How do I do that. What reference should I use?

Choose one, measure it. then measure the other. Or if you wish graphic assistance with 3RGB bars in addition to dE, set measured coordinates on number 1  as whitepoint, then measure with the other device get dE and a visual hint with RGB bars.

Let me rephrase my question:

Does those variations in instruments acceptable/known?

And is the difference between those two instruments big/huge that would mean one of them can be considered defective/unusable?

I do not know the actual color distance, since I not going to do dE calculations by myself. Typical scenario with an accurate CCSS colorimeter correction for W-LED PFS phosphor backlight on i1displaypro should be within a radius of max 3.X dE to actual color coordinates measured with a very high end spectrophotometer.
For example look for Eizo ColorEdge CS2731/CG319X or <5y models in Lift Gamma Gain forums. Stuart Pointon measured a few i1d3 (pro version AFAIK)

Reason for asking is that I found this comparison between the same two models and there is almost no difference:

https://www.youtube.com/watch?v=s2yFUXueH50

He is not using VDT as explained on my previous mesage (you did not measure distance to the same target on each measurement).

But once you did all suggested measurements if a higher than expected disagreement exists, I’ll trust more the QC in the pro if it has not suffered physical damage.
Ideal conditions would need to measure them against a i1pro2/3 at 3nm (high res mode), but if you cannot do that and if your CCSS file is a proper correction for your display model I’d be biased to trust the pro…. but it’s guessing

• This reply was modified 5 months, 4 weeks ago by Vincent.

[DarKHawK]

Thanks again for the detailed reply.

I must be honest with you and say that I don’t get most of what you’re explaining.

Here is what I think you mean:

1-     I will use a Spectral “ccss file” correction file, this file to be exact “Dell, DELL S2721D by 4KM (i1 Pro 2).ccss”

2-     Set the settings to sRGB

3-     Measure the i1 display pro. Note the results
4-     Measure the Colormunki Display with the same correction file, note the dE from set point of the i1 display pro. If the deviation is within 3.XE, this should be acceptable.
Here are the results:

I1 display pro: Monitors colors set to 100% all colors

Colormunki Display: Same monitor settings:

If I changed the monitor settings to R99% G100% B100%, I get this result:

• This reply was modified 5 months, 4 weeks ago by DarKHawK.

[Vincent]

 

3-     Measure the i1 display pro. Note the results
4-     Measure the Colormunki Display with the same correction file, note the dE from set point of the i1 display pro. If the deviation is within 3.XE, this should be acceptable.
Here are the results:

That is dE from 1st colorimeter to target (D65), and then dE from 2nd colorimeter to target. That is not exactly distance from WP measued by 1 and 2.

If I (1) am at 20 miles to city A and you (2) are 30 miles to city A, when can be at 10miles from each other or at 50 miles (on opposite sides) Do you get it now?
But both we are within a 30 miles radius from city A, we are “close” to city even if we “may” be “far” from each other.

ACTUAL distance from 1 to 2 is done by setting CIE xy coordinates measured in 1 as whitepoint target before measuring with 2 device. That would be Distance from 1 to 2 or “inter instrument agreement” error. It could be bigger than actual distance to a common reference (actual whitepoint of your display).

If you calibrate your display to D65 measured by one device, lets say 1, when you measure that new whitepoint with instrument 2 it “can” be a little far away. Inter instrument error.
That value is different than calibrating to D65 witha true reference measurement device and then measuring distance from that to 1 and then to 2.

[DarKHawK]

Thank you, Vincent, for your patience.

I’ve set x,y points with i1 display pro using “Visual whitepoint editor”.

Then calibrating using Colormunki Display I got this result:

dE is between 2.4 and 2.5. Is this acceptable?

[DarKHawK]

I did something that I don’t know if it will help identify the issue.
I measured and recorded the x,y values of red green and blue and white on the i1d3 and then measured the same values with the colormunki.
The difference in values are as follows:
white 0.0018 -0.0019
red 0.0009 -0.0007
green 0.0044 -0.0039
blue 0.0003 -0.0001

The big difference comes from green.

[Vincent]

CIE xyY euclidean distances are not human vision distances.

[DarKHawK]

I’ve set x,y points with i1 display pro using “Visual whitepoint editor”.

Then calibrating using Colormunki Display I got this result:

dE is between 2.4 and 2.5. Is this acceptable?

Is an inter instrument agreement of 2.4 dE acceptable?

• This reply was modified 5 months, 3 weeks ago by DarKHawK.
• This reply was modified 5 months, 3 weeks ago by DarKHawK.

[Vincent]

If A is expected to be closer than X to a reference value and distance from A to B is less than X, is it statistically expected?

• This reply was modified 5 months, 3 weeks ago by Vincent.

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