edipo

Q: iMac screen suddenly oversaturated. ML. Redish-magenta colors

I have my osx system since 2007. i recently upgraded to imac 2012, 21.5" and Mountain Lion  (from imac 2007, snow leopard). I do professional photography.

 

Everything was fine until i notice that in some photos, my magenta-redishh colors were way to saturated. I DO food photography, speccially salmon and this particular salmon hue is very  very saturated now.

 

Also i notice an increased "GAMMA" compared to my previous monitor, but i was expecting that on new imacs. Any way, this gamma enhancement increases overall contrast too making everything worst.

 

Tried to change the monitor profile (i´m using thedefault by now) and nothing changes. Is very annoying not having fine control over the iMac screen. The visual callibration method is very unreliable. I did not touch the "universal acces" contrast either, that is not the issue.

 

I´ll try to load in safe mode, maybe is there a nvidia CUDA driver error?

 

Please i need help .i´m afraid is a hardware issue.

 

thanks.

iMac, OS X Mountain Lion (10.8.5)

Posted on Oct 7, 2013 6:43 AM

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Q: iMac screen suddenly oversaturated. ML. Redish-magenta colors

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  • by edipo,

    edipo edipo Oct 30, 2013 8:24 AM in response to Kurt Lang
    Level 1 (0 points)
    Oct 30, 2013 8:24 AM in response to Kurt Lang

    Yes i did. With onyx, did not tried the other "long" method.

  • by Kurt Lang,

    Kurt Lang Kurt Lang Oct 30, 2013 9:43 AM in response to edipo
    Level 8 (37,681 points)
    Oct 30, 2013 9:43 AM in response to edipo

    Did you test to see if you were affected, first? That is, did you compare the color of icons directly on the desktop to the same items in a folder displayed in icon view? If they were already the same, and you were not using sRGB as your monitor profile in the system preferences, then your Mac was not being affected by this bug to start with.

  • by edipo,

    edipo edipo Nov 1, 2013 6:59 AM in response to Kurt Lang
    Level 1 (0 points)
    Nov 1, 2013 6:59 AM in response to Kurt Lang

    i´m using default (and only ) imac factory icc profile, allegedly calibrated this year by apple .

     

    I installed Mavericks today and contrast seems a little worst now. Dont know what to do-

  • by Kurt Lang,

    Kurt Lang Kurt Lang Nov 1, 2013 8:06 AM in response to edipo
    Level 8 (37,681 points)
    Nov 1, 2013 8:06 AM in response to edipo

    I installed Mavericks today and contrast seems a little worst now. Don't know what to do-

    Yes, that was also the first thing I noticed. Using the same profiling software and hardware, the desktop has more contrast than in Mountain Lion or Snow Leopard using the exact same profiling settings. But at least the mismatched color problem is gone.

  • by edipo,

    edipo edipo Nov 4, 2013 6:07 AM in response to edipo
    Level 1 (0 points)
    Nov 4, 2013 6:07 AM in response to edipo

    I installed mavericks on a flash drive, clean install. to check if i had same issue. And it behaves the same. oversaturated and contrasty. So it is not my instalation. tried to change the target gamma on visual calibration,  to "2" instead the imac native 2.21. and this is more pleasant to the eye.

  • by Kurt Lang,

    Kurt Lang Kurt Lang Nov 4, 2013 6:16 AM in response to edipo
    Level 8 (37,681 points)
    Nov 4, 2013 6:16 AM in response to edipo

    I sent a bug report to Apple explaining that there is a contrast / gamma change in Mavericks from previous versions of OS X. I also sent along this image to show the difference. On the left is Mountain Lion or Snow Leopard. On the right is how anything displays in comparison in Mavericks using the exact same profiling settings.

     

    MavericksColor.jpg

  • by edipo,

    edipo edipo Nov 4, 2013 6:25 AM in response to Kurt Lang
    Level 1 (0 points)
    Nov 4, 2013 6:25 AM in response to Kurt Lang

    Well. this adds more contrast to my previous imac/Mountain Lion gamma saturation issue. hahah. Maybe upgrading to Mavericks was not a good idea after all.

     

    Is there any problem using Target gamma lower than 2.2  on modern Osx / photo editing=?

     

    thanks.

  • by Kurt Lang,

    Kurt Lang Kurt Lang Nov 4, 2013 6:32 AM in response to edipo
    Level 8 (37,681 points)
    Nov 4, 2013 6:32 AM in response to edipo

    No. You can use any white point and gamma settings you want. It's all all you think represents natural color. Being in the printing industry, I use the defaults of a 5000K white point and a 1.8 gamma. I use those settings even for RGB work since photo prints also match very well to that.

     

    The defaults for photographers is considered 5500K, 2.2 gamma. That's pretty close to typical color viewing. Worldwide, the average and most commonly measured white point is 5300K. Don't ask me how the very bluish 6500K ever became the default white point. Almost no one sees color like that on a daily basis.

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