Monitor Calibration Issue - iMac 5k Late 2015

Forum|Forum|9 years ago
March 6, 2017
2 replies
13722 views

Hello,

i am using the i1 Display Pro to calibrate and i have noticed that when i compare my old profile to the new one, the new one has a grey/greenish tinge.. does anyone have a guide to properly calibrate an iMac 5k with the i1 Display Pro?

Thank you

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Correct answer D Fosse

That looks like a good and comprehensive guide.

I'd just like to add that if this is one of the new DCI-P3 panels (Apple's variety of wide gamut), it's possible that it uses "GBr LED" backlighting, not "White LED", and the software should be set accordingly. This will affect the measured white point.

Most traditional wide gamut panels use GBr LED.

Generally, the calibration targets should be set to match the paper/final output (not the other way round). The numbers aren't important, D65 or otherwise. Let the numbers fall wherever they want. Just get that monitor white=paper white match.

Temperature is just half the story. That's just the yellow/blue axis. There's also a green/magenta axis to consider, and if this can be adjusted do so.

D Fosse

Correct answer

Community Expert

That looks like a good and comprehensive guide.

I'd just like to add that if this is one of the new DCI-P3 panels (Apple's variety of wide gamut), it's possible that it uses "GBr LED" backlighting, not "White LED", and the software should be set accordingly. This will affect the measured white point.

Most traditional wide gamut panels use GBr LED.

Generally, the calibration targets should be set to match the paper/final output (not the other way round). The numbers aren't important, D65 or otherwise. Let the numbers fall wherever they want. Just get that monitor white=paper white match.

Temperature is just half the story. That's just the yellow/blue axis. There's also a green/magenta axis to consider, and if this can be adjusted do so.

mickspawnAuthor

Inspiring

Hello, GB-LED is indeed selected (cant see GBr LED) and i still have the weird look. Could it be the lighting in the room that affects the profile too and how it is made? i have changed lighting setup.. my old profile from my old light setup displays true whites, but the new profile i made with the new lighting setup shows a grey/green tinge.

trshaner do you mean instead of GB-LED try selecting RGB-LED?

when i calibrate the brightness.. i set it for 120 and my display either does 113 or 142.. should i be selecting 120 instead of 142? doesnt seem bright enough lol

how do i get the white=paper match?

Todd Shaner

Legend

how do i get the white=paper match?

The assumption here is that you can actually adjust the white point manually, until it looks right. With most monitor models you'd just do this through the OSD controls, where you would also set the luminance.

The point is that you want the calibrator to adjust as little as possible in the video card, where you only have 8-bit color depth. Strong adjustments here can easily result in banding and other artifacts. (In high-end monitors with hardware calibration it's all done in high bit depth internally in the monitor, so there the calibration software handles everything).

With an iMac I don't know if you have any adjustment possibilities at all. In that case I recommend setting i1Profiler to native white point, rather than having the software trying to adjust it in the video card. In other words, not D65, but native.

People generally attach far too much importance to numbers when setting calibration parameters. They think it must

be D65 and 120 because that's what "everybody" says. But the whole point is to have a reliable preview of what the final output will look like, and the numbers change with viewing conditions.

https://forums.adobe.com/people/D+Fosse wrote
how do i get the white=paper match?
With an iMac I don't know if you have any adjustment possibilities at all. In that case I recommend setting i1Profiler to native white point, rather than having the software trying to adjust it in the video card. In other words, not D65, but native.

It appears White point, Gamma, etc. are set using the Apple OS X Calibrator application, which then creates and assigns a new display profile. So what happens when you use the i1 Profiler software? Does the iMac retain the White point, Gamma and any other OSD settings made using the Apple OS X Calibrator application?

I found this X-Rite article concerning calibrating with the i1 Display Pro on a Mac. It provides instructions for copying an XRite_LinearProfile.icc to the ColorSync Profiles folder and then assigning it to the display. You do this BEFORE using the i1 Display Pro with it's i1 Profiler software.

Poor Results With i1Display Pro On Mac

NOTE: You'll need to change the instructions as shown below for your iMac with GB-r LED backlight:

1. Typically, users should select a white point of “D65”, a luminance setting of “120”, and “Native” for contrast ratio. If you have an Apple monitor manufactured after 2009, select “White LED” GB-LED for the display technology type.

That's enough to chock a horse.......Why does Apple make it so hard!