Contrast ratio results

Contrast ratio 125:1
Monitor model
Submitted 28 Feb 2019 02:18 CET, by 70.31.*.*
Camera model samsung SM-N920C
Processing remarks

Warning: image file 1: automatic white balance can cause inaccuracies.
Note: image file 1: suggested exposure time: 1/130 s (Set EV to -1.4)
Warning: image file 2: automatic white balance can cause inaccuracies.
Warning: Image ISO settings are not the same.

Black
Screen photo
Luminance 0.92 cd/m2
Luminance spread 0.53 cd/m2 (2 standard deviations)
Exposure value –2.51 stops   (aim for –2 to –3)
Exposure spread 0.85 stops
Area used for calculation 0.369 x 0.506
Camera settings Exposure time: 1/17   ISO: 1000   F-number: 1.9
Focal length: 28 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 115 cd/m2
Luminance spread 29 cd/m2 (2 standard deviations)
Exposure value –1.07 stops   (aim for –2 to –3)
Exposure spread 0.36 stops
Area used for calculation 0.368 x 0.509
Camera settings Exposure time: 1/50   ISO: 64   F-number: 1.9
Focal length: 28 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.