Contrast ratio results

Contrast ratio 3589:1
Monitor model
Submitted 05 Jul 2021 04:55 CEST, by 186.108.*.*
Camera model samsung SM-G998B
Processing remarks

Warning: Image ISO settings are not the same.
Warning: image file 3 is too bright to be a dark photo. Maybe you mixed up the files?

Black
Screen photo
Luminance 0.04 cd/m2
Luminance spread 0.02 cd/m2 (2 standard deviations)
Exposure value –2.64 stops   (aim for –2 to –3)
Exposure spread 0.62 stops
Area used for calculation 0.212 x 0.159
Camera settings Exposure time: 4   ISO: 400   F-number: 2.2
Focal length: 13 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 149 cd/m2
Luminance spread 14 cd/m2 (2 standard deviations)
Exposure value –2.11 stops   (aim for –2 to –3)
Exposure spread 0.14 stops
Area used for calculation 0.212 x 0.159
Camera settings Exposure time: 1/498   ISO: 320   F-number: 2.2
Focal length: 13 mm   (35 mm equivalent)
Exposure compensation: 0
Black at screen edge
Screen photo
Luminance 102 cd/m2
Luminance spread 8 cd/m2 (2 standard deviations)
Exposure value –2.34 stops   (aim for –2 to –3)
Exposure spread 0.12 stops
Area used for calculation 0.212 x 0.159
Camera settings Exposure time: 1/498   ISO: 400   F-number: 2.2
Focal length: 13 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.