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Gabriele Santucci
Participating Frequently
December 3, 2022
Answered

Gamma bug Photoshop 24.0.1

  • December 3, 2022
  • 5 replies
  • 3474 views

I think I found a bug on the latest version of Photoshop 24.0.1

 

There is a difference in gamma between photoshop and lightroom if you have an active calibration profile on your monitor.

 

Photoshop loses all information in shadows and blacks.

 

See attached video. The photo without the circles is when the calibration color profile is turned off.

 

Has anyone noticed the same bug?

 

I think it's a similar problem

 

https://community.adobe.com/t5/lightroom-classic-discussions/lightroom-5-icc-profiles-clipped-shadows-under-osx/td-p/5745759/page/5 

 

 

My device is a Mac Studio running macOS Ventura 13.0.1
MSI Summit MS321UP monitor
Calibrator: datacolor spayderx

This topic has been closed for replies.
Correct answer D Fosse

There is no such thing as "gamma bugs". But there is corrupt/defective monitor profiles, which is what this looks like. Run your Spyder again. To be safe, make sure it's set to make version 2 and matrix-based profiles, not version 4 or table-based (LUT). Both the latter are prone to problems in some configurations.

 

There is also a more rarely seen issue, where the wrong monitor profile is used in a dual display setup. This always, no exception, affects systems with an integrated internal display plus an external connected display. Usually it's iMac/MBP, but in a few cases also some Windows laptops. However, the heavily clipped blacks aren't something you would expect to see then. My money is on a bad profile from the Spyder.

5 replies

D Fosse
Community Expert
D FosseCommunity ExpertCorrect answer
Community Expert
December 30, 2022

There is no such thing as "gamma bugs". But there is corrupt/defective monitor profiles, which is what this looks like. Run your Spyder again. To be safe, make sure it's set to make version 2 and matrix-based profiles, not version 4 or table-based (LUT). Both the latter are prone to problems in some configurations.

 

There is also a more rarely seen issue, where the wrong monitor profile is used in a dual display setup. This always, no exception, affects systems with an integrated internal display plus an external connected display. Usually it's iMac/MBP, but in a few cases also some Windows laptops. However, the heavily clipped blacks aren't something you would expect to see then. My money is on a bad profile from the Spyder.

    B
    bildwerker
    Participating Frequently
    December 30, 2022

    thx D Foss for your feedback.

    i just did a new calibration. now with version 2 instead of version 4. seams a little bit better but still with clipping and artefacts. my first assumption was also a profile error or a problem with the graphics card. however, i have the same results in the very dark regions with both calibrators, 1display pro and spyder X. it seems that i have only had the problem since photoshop 24. however, until further notice I can live with my workaround to raise the contrast a little bit.  

    TheDigitalDog
    TheDigitalDog
    Inspiring
    December 30, 2022
    quote

    thx D Foss for your feedback.

    i just did a new calibration. now with version 2 instead of version 4. seams a little bit better but still with clipping and artefacts. my first assumption was also a profile error or a problem with the graphics card. however, i have the same results in the very dark regions with both calibrators, 1display pro and spyder X. it seems that i have only had the problem since photoshop 24. however, until further notice I can live with my workaround to raise the contrast a little bit.  


    By @bildwerker

    Do you have a full, high-bit display path? When in Photoshop, Preferences>Preformance, and open this dialog, do you see this:

    Again, there is no Photoshop gamma bug; there are displays with issues, profiles with issues, and display paths that are suboptimal. 

    Author “Color Management for Photographers" & "Photoshop CC Color Management/pluralsight"
    B
    bildwerker
    Participating Frequently
    December 30, 2022

    hi gabriele,

    i have been looking for someone with the same problem for weeks.

    my specs: Mac Studio Ultra,  MacOS Monterrey 12.6, 4 monitors.

    calibrated with 1DISPLAY PRO

     

    same problem with uggly black clipping in dark tones. I have tried many things to isolate the problem.

    older photoshop versions, new macOS Ventura, new calibrations, other display settings, using just one display and many more.

    the same images on my macbook pro and other macs looks perfekt, except the mac studio.

    my only workaround at the moment is to ad a little contrast in the apple system prefs > Accessibility > Display (see screenshots). the quality of the examples is very poor (lot of reflections) and dony by my mobile, but its the only way to see the issue. hope there is a solution. it makes it very unsafe to work in aprofessional way.

     

     

     

     

      G
      Gabriele SantucciAuthor
      Participating Frequently
      December 30, 2022

      I made these reports to Adobe, but they were unprofessional and did nothing to fix the problem. This problem occurs when you have an external monitor connected to your mac plus the monitor is calibrated with software. I hope someone hears this issue and does something about it

        TheDigitalDog
        TheDigitalDog
        Inspiring
        December 5, 2022

        Nope, Apple didn't mess up; I'm running dual displays without issue on the latest Mac OS.

        Author “Color Management for Photographers" & "Photoshop CC Color Management/pluralsight"
        G
        Gabriele SantucciAuthor
        Participating Frequently
        December 5, 2022

        There is no error in the calibration. On my windows PC this bug is not there.
        This bug occurs if you have an external monitor and an active ICC calibration profile.

        I think apple changed something and adobe didn't notice. The same problem exists with other applications

        TheDigitalDog
        TheDigitalDog
        Inspiring
        December 3, 2022

        Don't see a video, just JPEGs.

        No, I haven't noticed this; all is fine between the two, but it is critical to compare the two products this way: In Lightroom Classic only in Develop Module, no others, and at 1:1 zoom vs. Photoshop at 100% zoom. Do not zoom out. 

        Upload a sample document in something like Dropbox so others can test and reply to what they see. '

        Very likely a display profile issue. 

        Recalibrate and build a new ICC display profile; the old one might be corrupted. If you are using software/hardware for this task, be sure the software is set to build a matrix, not LUT profile, Version 2, not Version 4 profile.


        If that doesn't work, disable GPU in preferences in both products and tell us if you see a match. 

        Author “Color Management for Photographers" & "Photoshop CC Color Management/pluralsight"
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