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Oct 29, 2014 10:37 AM in response to cooprikby Johnb-one,sure-go into accessibility under system preferences and there you will see adjustment of display contrast, otherwise go to display preferences and there change brightness. I know if you are able to do a re-calibration on your monitor (can you do that on an iMac??) then you can adjust the gamma, brightness, color gamut, etc from there
sorry, that's all I have
John B