Contrast ratio results

Contrast ratio 958:1
Monitor model
Submitted 12 Aug 2015 20:49 CEST, by 77.78.*.*
Camera model Canon PowerShot SX160 IS
Processing remarks

image file 2: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen.

Black
Screen photo
Luminance 0.1 cd/m2
Luminance spread 0.05 cd/m2 (2 standard deviations)
Exposure value –3.4 stops   (aim for –2 to –3)
Exposure spread 0.8 stops
Area used for calculation 0.406 x 0.406
Camera settings Exposure time: 2.5   ISO: 400   F-number: 3.5
Focal length: 28.1 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 95 cd/m2
Luminance spread 82 cd/m2 (2 standard deviations)
Exposure value –2.13 stops   (aim for –2 to –3)
Exposure spread 1.34 stops
Area used for calculation 0.406 x 0.406
Camera settings Exposure time: 1/159   ISO: 400   F-number: 3.5
Focal length: 28.1 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.