Contrast ratio results

Contrast ratio 11677:1
Monitor model
Submitted 23 Oct 2020 01:58 CEST, by 80.189.*.*
Camera model Xiaomi M2007J20CG
Processing remarks

Warning: image file 1: automatic white balance can cause inaccuracies.
image file 1: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.
Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 0.8 s (Set EV to +3.3)
Warning: image file 2: automatic white balance can cause inaccuracies.
Note: image file 2: suggested exposure time: 1/310 s (Set EV to -1.6)
Warning: Image ISO settings are not the same.

Black
Screen photo
Luminance 0.01 cd/m2
Luminance spread 0.01 cd/m2 (2 standard deviations)
Exposure value –5.84 stops   (aim for –2 to –3)
Exposure spread 1.27 stops
Area used for calculation 0.33 x 0.448
Camera settings Exposure time: 1/12   ISO: 6400   F-number: 1.9
Focal length: 25 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 118 cd/m2
Luminance spread 6 cd/m2 (2 standard deviations)
Exposure value –0.85 stops   (aim for –2 to –3)
Exposure spread 0.07 stops
Area used for calculation 0.332 x 0.442
Camera settings Exposure time: 1/100   ISO: 145   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.