Contrast ratio results

Contrast ratio 42187:1
Monitor model
Submitted 15 Jun 2018 20:23 CEST, by 124.120.*.*
Camera model samsung SM-A910F
Processing remarks

Warning: image file 1: automatic white balance can cause inaccuracies.
Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 76.4 s (Set EV to +9.3)
Warning: image file 2: automatic white balance can cause inaccuracies.
Note: image file 2: suggested exposure time: 1/69 s (Set EV to -1.1)
Warning: Image ISO settings are not the same.

Black
Screen photo
Luminance 0 cd/m2
Luminance spread 0 cd/m2 (2 standard deviations)
Exposure value –11.75 stops   (aim for –2 to –3)
Exposure spread 1.15 stops
Area used for calculation 0.396 x 0.379
Camera settings Exposure time: 1/8   ISO: 800   F-number: 1.9
Focal length: 27 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 38 cd/m2
Luminance spread 2 cd/m2 (2 standard deviations)
Exposure value –1.43 stops   (aim for –2 to –3)
Exposure spread 0.08 stops
Area used for calculation 0.475 x 0.31
Camera settings Exposure time: 1/33   ISO: 100   F-number: 1.9
Focal length: 27 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.