2 calibrated monitors look very different?

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  • #142803

    ViRazY
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    Hello, this is my first time calibrating monitors and after multiple attempts, I can’t get 2 monitors of mine to look even remotely similar after calibration.

    I am using DisplayCal 3.9.14-2 under Arch Linux with a Spyder5. The ICC profiles are applied in the Sway config file and I do notice them changing the colors of the monitors.

    The 2 monitors in question are the AOC 24G4XE and iiyama XU2292HSU-B6 (rotated 90° clock-wise). In the software, I set the instrument mode to “LCD White LED” as pointed out on displayspecifications.com, left the correction at none, set the whitepoint to 6500K, the white level to 120.00 cd/m2 and the tone curve to Gamma 2.2.

    The calibration was done at low speed in a dark room and I adjusted the monitor color and brightness controls to align the bars with the arrows. No dynamic settings are enabled anywhere, from what I can tell.

    The most noticable difference is that on the iiyama monitor, everything has a slight green tint to it. In particular what’s supposed to be a very slightly blue-ish grey looks almost swampy green-grey. This does not appear to be the case on the AOC monitor, which looks more “accurate” to my (untrained) eyes. Not having the ICC profile applied to the iiyama Monitor makes that particular color look more correct too.

    I understand that both the monitors and the device I am using are not the most accurate and that I can’t expect them to be 100% identical, however they look less similar after calibration compared to stock settings and the slight green tint on the iiyama monitor consistently happens after 3 separate attempts.

    Any advice? Did I overlook something obvious? Thanks!

    • This topic was modified 1 year, 4 months ago by ViRazY.
    #142809

    Vincent
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    I understand that both the monitors and the device I am using are not the most accurate and that I can’t expect them to be 100% identical, however they look less similar after calibration compared to stock settings and the slight green tint on the iiyama monitor consistently happens after 3 separate attempts.

    Any advice? Did I overlook something obvious? Thanks!

    As it has been explained on several several threads:

    -choose the whitest display
    -on the other display, calibration tab, whitepoint, chromaticity coordinates, choose visual white point editor (3 ball icon).
    A popup show up, choose visually a white that matches the other display. Then OK and displayCAL will measure your visually chosen white as whitepoint coordinate.

    Photoshop and other tools do not care about non D65 whitepoints, all rendering is whitepoint relative. But if you do a LUT3D for that visually matches displkay, remember to do not use absolute colorimetric with default Rec709/sRGB profile, it will undo that visual match. The easiest choice will be rel colorimetric although there are other more complicated options.

    #142822

    ViRazY
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    Thank you.

    Just to make sure I get those steps right:
    – I start with both monitors at default settings, without any ICC profiles loaded.
    – I launch DisplayCAL for the whitest monitor (in my case the AOC one), adjust the white point in the editor you mentioned (using the controls in the editor, not the monitor controls?) to match the second monitor (display a white screen on it as reference, I guess?) and hit measure while the Spyder5 is in the measurement area.
    – Then calibrate and profile? If so, should I still set the white level to something specific, like 120 cd/m2? What about the R/G/B and brightness bars on the next screen? Do I still adjust my monitor settings at this point to get those aligned correctly?

    Afterwards, what do I do on the other monitor? Repeat the same steps, but with the generated ICC profile already loaded on the whitest monitor?

    Sorry if some of this seems dumb or obvious, but as I said, first time doing this.

    #142823

    ViRazY
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    Also, I read in some forum post that the Spyder5 can have problems with rotated monitors. Is that true? Would it help to rotate the iiyama monitor back to its normal orientation for calibration?

    #142824

    Vincent
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    Thank you.

    Just to make sure I get those steps right:
    – I start with both monitors at default settings, without any ICC profiles loaded.
    – I launch DisplayCAL for the whitest monitor (in my case the AOC one), adjust the white point in the editor you mentioned (using the controls in the editor, not the monitor controls?) to match the second monitor (display a white screen on it as reference, I guess?) and hit measure while the Spyder5 is in the measurement area.

    The opposite. Visual white point editor is meant to be used in the least white, using the whitest as reference. You keep your profile in the whitest one.

    – Then calibrate and profile? If so, should I still set the white level to something specific, like 120 cd/m2?

    match numerically then visually as in whitepoint.

    What about the R/G/B and brightness bars on the next screen? Do I still adjust my monitor settings at this point to get those aligned correctly?

    the RGB bars should aim not to D65 but to the measured coordinates that make the white closer to the reference. So you need to tweak them.

    Afterwards, what do I do on the other monitor? Repeat the same steps, but with the generated ICC profile already loaded on the whitest monitor?

    As said before the whitest one will keep the RGB gains untouched from your current values and your current custom ICC profile. “The whitest is OK”.

    Sorry if some of this seems dumb or obvious, but as I said, first time doing this.

    • This reply was modified 1 year, 4 months ago by Vincent.
    #142836

    ViRazY
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    Alright, so then when I have the visual white point editor open, which controls do I adjust to make them match? The RGB values in the editor window, or the RGB controls of the monitor?

    I assume I use the controls in the window there and then use the monitor controls in the calibration step?

    • This reply was modified 1 year, 4 months ago by ViRazY.
    #142838

    Vincent
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    RGB in Editor, then measure. Later on calibration stage with RGB bars use RGB gains on monitor to match previously measured alternative whitepoint coordinates.

    #142839

    ViRazY
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    Thank you, but it looks like the result ended up being the same as before, unfortunately. I’ll see if it might be an issue unrelated to DisplayCAL.

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