Contrast ratio results

Contrast ratio 3861:1
Monitor model
Submitted 22 Jun 2021 11:00 CEST, by 147.158.*.*
Camera model Xiaomi M2007J20CG
Processing remarks

Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 18.2 s (Set EV to +3.2)

Black
Screen photo
Luminance 0.01 cd/m2
Luminance spread 0 cd/m2 (2 standard deviations)
Exposure value –5.69 stops   (aim for –2 to –3)
Exposure spread 0.29 stops
Area used for calculation 0.361 x 0.361
Camera settings Exposure time: 2   ISO: 400   F-number: 1.9
Focal length: 25 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 29 cd/m2
Luminance spread 3 cd/m2 (2 standard deviations)
Exposure value –2.42 stops   (aim for –2 to –3)
Exposure spread 0.17 stops
Area used for calculation 0.361 x 0.361
Camera settings Exposure time: 1/200   ISO: 400   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.