Contrast ratio results for Mac

Contrast ratio 485:1
Monitor model Mac
Submitted 01 Aug 2015 03:12 CEST, by 90.177.*.*
Camera model Canon PowerShot G7 X
Processing remarks

Warning: image file 2: exposure time below 1/500 sec is unreliable. Try increasing the EV compensation.

Black
Screen photo
Luminance 0.19 cd/m2
Luminance spread 0.07 cd/m2 (2 standard deviations)
Exposure value –1.86 stops   (aim for –2 to –3)
Exposure spread 0.51 stops
Area used for calculation 0.335 x 0.377
Camera settings Exposure time: 1   ISO: 400   F-number: 1.8
Focal length: 24.1 mm   (35 mm equivalent)
Exposure compensation: 4
White
Screen photo
Luminance 93 cd/m2
Luminance spread 42 cd/m2 (2 standard deviations)
Exposure value –3.9 stops   (aim for –2 to –3)
Exposure spread 0.67 stops
Area used for calculation 0.335 x 0.377
Camera settings Exposure time: 1/2004   ISO: 400   F-number: 1.8
Focal length: 24.1 mm   (35 mm equivalent)
Exposure compensation: -8

The luminance values in cd/m2 are not very reliable, since camera sensitivities can easily differ up to 50% from their nominal value. Typically, the real luminance is 30% lower than this number. The area used for calculation is chosen such that it corresponds to a viewing angle of ±14° horizontally and ±10.5° vertically, which is equivalent to viewing the screen from a distance of about 1.5 times the diagonal size.

Unfortunately, there is a lot of variation in how cameras use EXIF settings. If photos from your camera your produce unusable results, try coming back in a few days. I review submitted pictures regularly and try to fix problems.