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Contrast ratio results for Mac

Contrast ratio 1035:1
Monitor model Mac
Submitted 01 Aug 2015 03:08 CEST, by 90.177.*.*
Camera model Canon PowerShot G7 X
Processing remarks

Note: image file 1: suggested exposure time: 0.9 s (Set EV to +1.2)
Warning: image file 2: exposure time below 1/500 sec is unreliable. Try increasing the EV compensation.

Black
Screen photo
[open image]
Luminance 0.13 cd/m2
Luminance spread 0.05 cd/m2 (2 standard deviations)
Exposure value –3.74 stops   (aim for –2 to –3)
Exposure spread 0.52 stops
Area used for calculation 0.335 x 0.377
Camera settings Exposure time: 0.4   ISO: 400   F-number: 1.8
Focal length: 24.1 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 134 cd/m2
Luminance spread 46 cd/m2 (2 standard deviations)
Exposure value –1.71 stops   (aim for –2 to –3)
Exposure spread 0.5 stops
Area used for calculation 0.335 x 0.377
Camera settings Exposure time: 1/636   ISO: 400   F-number: 1.8
Focal length: 24.1 mm   (35 mm equivalent)
Exposure compensation: 0

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.