Contrast ratio results

Contrast ratio 25133:1
Monitor model
Submitted 23 Oct 2020 02:05 CEST, by 80.189.*.*
Camera model Xiaomi M2007J20CG
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: 15.5 s (Set EV to +7.5)
Warning: image file 2: automatic white balance can cause inaccuracies.
Warning: image file 2: Overexposed. Please decrease the shutter time.

Black
Screen photo
Luminance 0 cd/m2
Luminance spread 0 cd/m2 (2 standard deviations)
Exposure value –10.04 stops   (aim for –2 to –3)
Exposure spread 0.8 stops
Area used for calculation 0.329 x 0.452
Camera settings Exposure time: 1/12   ISO: 800   F-number: 1.9
Focal length: 25 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 110 cd/m2
Luminance spread 7 cd/m2 (2 standard deviations)
Exposure value –0.48 stops   (aim for –2 to –3)
Exposure spread 0.09 stops
Area used for calculation 0.33 x 0.446
Camera settings Exposure time: 1/400   ISO: 800   F-number: 1.9
Focal length: 25 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.