Black level

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  1. Posts : 1,286
    X
       #1

    Black level


    I have a pair of 27" monitors on my Windows 10 desktop. They're AOC model E2752. I have a completely black desktop, no background image.

    I noticed that the "black" is not really black. It just dark gray. I presumed that these must be cheap monitors, lacking the ultra-black capability of better monitors.
    But no! I opened the Nvidia control panel (I have an Nvidia 1060 card) and starting messing around. I found this:
    Black level-nv.png

    Notice the "Digital Vibrance" setting. It's at 50% for this monitor (and likewise for the other one).
    I changed it a smidge ... up to 51% ... and the black background became as black as coal. Nice.
    I moved the control further up and down, with no change. (It does change the color intensity as I go extremely high or low, but never mind that.)

    I moved it back to 50% and the background remains nicely black ... for a while.
    Eventually it returns to its former dark gray ... at which time I can once again jog the digital vibrance up or down, and get the nice deep black once again.
    I have not yet noticed what triggers the return-to-gray.
    Maybe after a sleep-wake cycle?
    Maybe after running some program?
    Maybe when the squirrels are running around in the back yard?

    I just don't know. But I do know this: I want my proper, totally black background to "stick". I don't know why it won't, and I don't know the cause.
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  2. Cliff S's Avatar
    Posts : 25,566
    Win10 Pro, Win10 Pro N, Win10 Home, Windows 8.1 Pro, Ubuntu
       #2

    For desktop, have you check the Change Resolution tab and looked at your color bit depth settings?
    Black level-image.png

    Also in video settings switch to Full 0-255 in the Advanced tab.
    Black level-image.png
    Do this for all monitors.

    Then make adjustments to black level and white saturation.
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  3. Posts : 1,286
    X
    Thread Starter
       #3

    Thanks. I made that change ... and I'm still dark gray.
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  4. Cliff S's Avatar
    Posts : 25,566
    Win10 Pro, Win10 Pro N, Win10 Home, Windows 8.1 Pro, Ubuntu
       #4

    margrave55 said:
    Thanks. I made that change ... and I'm still dark gray.


    Do you have your monitors color profile installed?
    You can generally get that at the monitors drivers page.
    Then go to control panel and select it as default in color management using Add button.
    Black level-image-008.png

    Black level-image.png
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  5. Posts : 1,964
    Windows 10
       #5

    You are going on about black level but actually using controls that don't directly affect this.

    Nvidia has their own way of describing things, "Digital vibrance" rather than colour saturation etc.

    By increasing the colour saturation the nominal black colour is below the black level of the monitor thus actually cutting off.

    It is a matter of personal opinion, but I always prefer a very dark gray to pitch black knowing that nothing a very dark gray colour is being cutoff.

    I see your monitor has DCR dynamic contrast ratio which will also affect this. Not to mention "viewing styles" as well.

    I would fix on one "viewing style" and switch off DCR so that there is no autoing, and reduces the amount of variables.
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  6. Posts : 1,286
    X
    Thread Starter
       #6

    I found the Color Management screen, and it shows this:
    Black level-color.management.png
    That's for display 1. And for display 2 it's the same.

    It references file 2752H.icm ... so I searched C: for that file. Not found. Maybe that's a problem?

    I searched on AOC's web site, hoping to find that file for download ... but those guys are worthless. No manuals, no support, nothing.
    Anyway ... I don't know what I would do even if I could obtain a copy of 2752H.icm

    As for the DCR thing ... I'll have to go back and look for that setting (and turn it off) later today.
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  7. Posts : 1,964
    Windows 10
       #7

    Your ICC profile is OK, it is installed for your monitors.
    No problem with that. To actually use it you would select it and Set as Default Profile.

    You will find the ICM files in C:\Windows\System32\spool\drivers\color

    Windows updates has already downloaded and installed it when you first connected up your monitors, whilst you were not looking...

    Similar models listed on the AOC website, though cannot find an exact match, they vary models with countries but you don't need that it's been done.
    http://www.aocmonitorap.com/sg/download_driver.php
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  8. Posts : 1,286
    X
    Thread Starter
       #8

    DCR is off, and always has been.

    Right now the screens are black, as they should be. Not sure whether that will last long.
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  9. Posts : 1,286
    X
    Thread Starter
       #9

    One monitor is back to gray again. The other is black.

    Any other idea, guys?
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  10. Posts : 1,964
    Windows 10
       #10

    Depends on your monitor, but on my Dell using ICM colour profiles unsurprisingly fixes certain monitor controls though this maybe due to it being a calibrated model.

    No idea what AOC do, or what controls you have, but two monitors will not be identical and this threshold maybe different on each one you are in the range of 0.4% assuming 256 gray levels.

    There is no way even two nominally identical monitors are going to be matched to 0.4%.

    You see in the Nvidia Controls the black level can be set artificially higher on the scale, post #2
    This also effects the dynamic range available for display.

    You yourself said a change of 1% on colour saturation affects it, no surprise there.

    All you can do is have a slightly different profile set for each monitor.

    I find this website useful for checking on Monitor calibration etc.
    http://www.lagom.nl/lcd-test/
    Last edited by Helmut; 20 Nov 2018 at 08:47.
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