Heavy red tint after calibration

Home Forums Help and Support Heavy red tint after calibration

Viewing 9 posts - 16 through 24 (of 24 total)
  • Author
    Posts
  • #31740

    Vincent
    Participant
    • Offline

    On a 700:1-1000:1 display trying to show 2.2 or 2.4 gamma about two near black greys are going to show almost equal or visually equal. Asume 100cd/m2 and do the maths.
    Anyway, measure them. RGB 000, RGB 1 1 1, RGB 2 2 2, RGB 3 3 3 and let’s see if there is a crush or just very close values.

    #31747

    DahakaMVl
    Participant
    • Offline

    Maybe banding is a better descriptor than crushing? See attachments. One is from my monitor that has no problem with calibration, one is from the one with problems. And the one with problems should have far better colors.

    Attachments:
    You must be logged in to view attached files.
    #31751

    DahakaMVl
    Participant
    • Offline

    Another example since  I can’t edit the post above. You can see that the black tones are distinct, but the are very far apart.

    In the other example you can see his eye in the good one, but just squares in the bad one.

    • This reply was modified 2 months, 2 weeks ago by DahakaMVl.
    • This reply was modified 2 months, 2 weeks ago by DahakaMVl.
    Attachments:
    You must be logged in to view attached files.
    #31759

    Vincent
    Participant
    • Offline

    This can be caused by low quality monitor and should be present even disabling GPU calibration mosty non correctable,

    or

    can be caused by GPU calibration (low bitdepth + no dithering) on bad monitor (because it needs more correction), non corretable unless you try to enable dithering (read sticky thread for nvidias) or change GPU for other without those issues.

    #31763

    DahakaMVl
    Participant
    • Offline

    Both displays are 8 bit. My point is that the video compression is clearly visible on one monitor and not on the other because of the black values.

    #31764

    Kuba Trybowski
    Participant
    • Offline

    Do you get the same results with Datacolor’s calibration app?

    #31765

    Vincent
    Participant
    • Offline

    Both displays are 8 bit. My point is that the video compression is clearly visible on one monitor and not on the other because of the black values.

    ->

    This can be caused by low quality monitor and should be present even disabling GPU calibration, mosty non correctable,

    or

    can be caused by GPU calibration (low bitdepth + no dithering) on bad monitor (because it needs more correction), non corretable unless you try to enable dithering (read sticky thread for nvidias) or change GPU for other without those issues.

    It does not matter if link between GPU and display is limitd to 8bit.

    #31780

    DahakaMVl
    Participant
    • Offline

    Do you get the same results with Datacolor’s calibration app?

    The results with the SpyderX software seem comparable.

    SpyderX Pro on Amazon  
    Disclosure: As an Amazon Associate I earn from qualifying purchases.

    #31801

    Алексей Коробов
    Participant
    • Offline

    Have you changed videocard together with display? Profiles usually breaks gradients. This happens in two stage: by videocard with rough calibration (linearization) curves correction (these are loaded to videocard, you flashed them when chose “reset”), and by rough CMS work (like Ps does, but Lr not). AMD only implemets vcgt correction well (use full driver), some NVidia cards can do it with some hack, but NVidia ignores user complaints for unknown reason. Try to change curves bit depth in Profile Loader drop down menu. The third chain link is your display innterface, internal bit depth and panel bit depth.

    P.S. There’s well known problem of different gamma for video. Rec.709 has 2.4 gamma (high contrast “in numbers”,  more detailed dark area), while consumer displays usually have gamma near 2.2 and sRGB has linear (=1) gamma in dark area. The problem is also depends on your movie player, it may or may not support track and display profile gamma. Movie player may be incompatible with XYZLUT profiles, try to use simplistic 1xCurve. You can also try to set gamma 2.4 in display menu and calibrate display for 2.4.

Viewing 9 posts - 16 through 24 (of 24 total)

You must be logged in to reply to this topic.

Log in or Register

Display Calibration and Characterization powered by ArgyllCMS