Contrast ratio results

Contrast ratio 350270:1
Monitor model
Submitted 21 Mar 2021 18:15 CET, by 106.154.*.*
Camera model samsung SM-G998B
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: 1176.0 s (Set EV to +10.4)
Warning: image file 2: automatic white balance can cause inaccuracies.
Note: image file 2: suggested exposure time: 0.3 s (Set EV to -1.6)
Warning: Image ISO settings are not the same.
Warning: Image F-number settings are not the same.
Warning: Image focal lengths/zoom levels are not the same.

Black
Screen photo
Luminance 0 cd/m2
Luminance spread 0 cd/m2 (2 standard deviations)
Exposure value –12.85 stops   (aim for –2 to –3)
Exposure spread 1.39 stops
Area used for calculation 0.347 x 0.347
Camera settings Exposure time: 0.9   ISO: 3200   F-number: 1.8
Focal length: 24 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 4.56 cd/m2
Luminance spread 0.25 cd/m2 (2 standard deviations)
Exposure value –0.86 stops   (aim for –2 to –3)
Exposure spread 0.08 stops
Area used for calculation 0.188 x 0.188
Camera settings Exposure time: 1   ISO: 50   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.