Strange Gamma Value Test for 2017 iMac

Discussion in 'iMac' started by Smoothie, Jul 11, 2017.

  1. Smoothie macrumors 6502

    Joined:
    Jun 23, 2007
    Location:
    California
    #1
    This has got me perplexed. I just went to a couple of websites that can test the gamma value of a monitor. You do this by looking at a test image. The gamma value is where you can't distinguish between the patterns when looking at them from a distance. For example, you can check your monitor at this website.

    http://www.normankoren.com/makingfineprints1A.html

    Scroll down more than half way to where it says "Gamma and Black Level Chart." The test image is on the right and looks like this:

    Gamma Chart.png

    An example of a gamma of 2.0 looks like this:

    Gamma Test Example.jpg

    What's weird is that when I test my iMac using the image while it's embedded in the web page, the gamma shows a value of about 1.3, which is way off. But when I save the test image to my desktop and use that image for the test, the gamma has the correct value of 2.2. I've tried two different browsers with the same result.

    When I tried the same test with a Dell monitor, the gamma was the same value of 2.2 for both images. What's causing this?
     
  2. DisMyMac macrumors 65816

    DisMyMac

    Joined:
    Sep 30, 2009
    #2
  3. Smoothie thread starter macrumors 6502

    Joined:
    Jun 23, 2007
    Location:
    California
    #3
    I use Firefox on both the iMac and the Dell, so it can't be the browser. I also used Safari on the iMac with the same result.
     

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