Contrast ratio results

Contrast ratio 57:1 (edge: 30:1)
Monitor model
Submitted 06 Sep 2018 23:16 CEST, by 140.0.*.*
Camera model samsung SM-N910H
Processing remarks

Warning: image file 3: automatic white balance can cause inaccuracies.
Warning: Image ISO settings are not the same.

Black
Screen photo
Luminance 1.84 cd/m2
Luminance spread 3.21 cd/m2 (2 standard deviations)
Exposure value –3.25 stops   (aim for –2 to –3)
Exposure spread 3.87 stops
Area used for calculation 0.411 x 0.548
Camera settings Exposure time: 1/17   ISO: 400   F-number: 2.2
Focal length: 31 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 106 cd/m2
Luminance spread 17 cd/m2 (2 standard deviations)
Exposure value –1.86 stops   (aim for –2 to –3)
Exposure spread 0.24 stops
Area used for calculation 0.411 x 0.548
Camera settings Exposure time: 1/370   ISO: 400   F-number: 2.2
Focal length: 31 mm   (35 mm equivalent)
Exposure compensation: 0
Black at screen edge
Screen photo
Luminance 3.52 cd/m2
Luminance spread 7.49 cd/m2 (2 standard deviations)
Exposure value –2.2 stops   (aim for –2 to –3)
Exposure spread 4.25 stops
Area used for calculation 0.411 x 0.548
Camera settings Exposure time: 1/25   ISO: 640   F-number: 2.2
Focal length: 31 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.