Gamma not applied correctly after calibration?

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  • #25525

    Valoran
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    Hello!

    I am a middling novice in the world of monitor calibration, and am new to many things so I apologise if what i’m about to say sounds silly.

    I bought a spyder x pro to calibrate my new monitor ( LG 34GN850 ) which went very well. However I have since returned that monitor and i’m back on my old TN panel ( Zowie XL2735 ) and wanted to calibrate it as well.

    I selected the standard settings, white point 6500k, white level 120 cd/m2, and a relative gamma of 2.2.

    The calibration goes through perfectly, and the reports tell me I have very good results, however the gamma seems to not be applying at all.

    The gamma looks to be closer to 2.0, which is verified by every gamma test chart I can find, while also looking very washed out in general.

    So after much testing, I tried calibrating to something silly to see if it would change visually at all, and I calibrated with a custom gamma of 2.5 and there is zero visual change when switching from the 2.2 profile to the 2.5 profile.

    This wasn’t a problem when I calibrated the LG monitor, as the gamma was correct “out of the box” so to speak with a 2.2 option in the OSD, whilst this monitor doesn’t have any options that get close enough.

    Am I missing something here? I would greatly appreciate any help with this.

    I have attached a verification report.

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    #25527

    Valoran
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    Here is my calibrated profile

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    #28101

    Johnny Silverhand
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    Absolutely the same problem. Although using Color Munki Display and its software.

    Tried DisplayCAL – same. No change in gamma at all. I get around 1.7-1.8. I did the “reset drivers gamma” option too. I had the feeling something’s not right so I tried the same thing made ridiculous settings on the display and gamma 3. Got wrong picture with 1.8 gamma. What’s going on?

    I bought LG 27GN750-B and I’m trying to calibrate it. My previous monitor was Samsung 27SD590. With the Samsung I had perfect calibration. I just changed the monitors. Everything else is the same.

    So my best guess is that something is remembering the old settings. Either nVidia driver or Windows somewhere.

    Any ideas? I guess I’ll DDU the driver and make clean install now.

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    #28102

    Vincent
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    @Valoran
    Instrument: SpyderX — Generic
    Correction: None

    #28127

    Алексей Коробов
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    Have you tried to set different gamma in monitor menu? Generally, small permanent gamma shift in test shouldn’t be an issue.

    #28135

    Johnny Silverhand
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    Have you tried to set different gamma in monitor menu? Generally, small permanent gamma shift in test shouldn’t be an issue.

    So I continue to test this situation since I’m not very familiar and with deep knowledge about colors and calibration I’m not sure but what I found.

    I DDUed nVidia drivers. Installed it clean and monitor driver. Did the calibration and again in those online gamma test pictures I have 1.7 gamma. I do the gamma to 2.2 with Windows Calibration. Now those test pictures show perfect 2.2 gamma but everything else is super dark.

    So now I have the impression that the Color Munki calibration is OK but those pictures are not accurate? Which is very strange since with my old monitor after the calibration I had those same pictures with perfect 2.2 gamma.

    I don’t know what is going on but it seems picture is good.

    Very strange situation. If anyone have any idea why is this happening please share. 🙂

    #28226

    Johnny Silverhand
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    I still don’t understand.

    I change the gamma through the Windows Calibration and it’s just fine. Or through nVidia settings. But the profile I make with ColorMunki always have gamma 1.8.

    Tried changing to HDMI from DisplayPort. Same.

    Tried all kind of settings from the monitor – nothing works. The only way I see gamma 2.2 is with the default monitor settings which are at 250 lumens that are destroying my eyes. What the hell is going on?

    #28231

    Алексей Коробов
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    1. That’s not issue if DisplayCAL doesn’t achive target gamma (gamma, that you want to get for resulting ICC profile). ICC profile corrects color with several steps, so if gamma 2.2 is not achieved, this will be compensated by other steps. But wrong gamma cause more contrast problems in non color managed applications (i.e. when seeing photos with embeded Windows viewer) and it cause worse tolerance of ICC profile at all.
    2. Check if Windows calibration is off (see attached screenshot) and DisplayCAL Profile Loader tray icon appears and is colored like rainbow.
    3. Have you tried non-standard contrast in monitor menu? Do you use custom color mode (when you can change RGB level) or presets like Cinema/Text/sRGB only? Is low blue light off?
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    #28254

    Johnny Silverhand
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    1. That’s not issue if DisplayCAL doesn’t achive target gamma (gamma, that you want to get for resulting ICC profile). ICC profile corrects color with several steps, so if gamma 2.2 is not achieved, this will be compensated by other steps. But wrong gamma cause more contrast problems in non color managed applications (i.e. when seeing photos with embeded Windows viewer) and it cause worse tolerance of ICC profile at all.
    2. Check if Windows calibration is off (see attached screenshot) and DisplayCAL Profile Loader tray icon appears and is colored like rainbow.
    3. Have you tried non-standard contrast in monitor menu? Do you use custom color mode (when you can change RGB level) or presets like Cinema/Text/sRGB only? Is low blue light off?

    Yeah, I disable Windows Calibration and my Color Profile Keeper before the calibration. I tried all kind of different settings. I use “Gamer 1 / Gamer 2” monitor profiles – which are the ones that give you full control over RGB settings. I’m not using nothing automatic. Disabled all auto-brightness things etc.

    Okay you say that the ICC profile corrects the colors in other ways. But why I did get 2.2 with my old monitor without any problems? Why can I get 2.2 manually through nVidia Settings but I can’t get it with the ICC? I don’t understand.

    And all the reviews say that the LG 27GN750-B has perfect sRGB with gamma 2.2 after calibration. So I’m confused.

    #28256

    Johnny Silverhand
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    Okay I fixed the problem.

    Look I know it sounds super strange. And it is. I’ve no idea what and why is this happening but as one of the last resorts while “debugging” the problem I remembered that on my Samsung 27SD590 I was using it with overclocked refresh rate from 60 to 75Hz. Which in some odd way was making the overall look smoother. And I was calibrating it on 75Hz etc.

    So I thought let’s see how far I can overclock the LG from 240Hz. I didn’t even use the CRU just through the nVidia driver I managed 250Hz. And to my surprise using the ICC I already had from yesterday’s calibrating now my gamma is 2.2.

    I don’t know what to say but it’s what it is. Somehow overclocking your default Hz of a monitor gives you the sweet 2.2 gamma. :O

    #28257

    Johnny Silverhand
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    Okay another info I just learned.

    Saw that after I clocked the monitor to 250Hz the DAS function is disabled. Reading in other forum there are people saying that DAS makes colors and picture a lot worse for the better latency. So maybe DAS was the culprit for not getting perfect gamma? IDK.

    If DAS works only on max refresh rate of a monitor I guess I could try it on 144/60Hz and see if I get 2.2 gamma too. But I’m not in the mood for testing this atm.

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