Contrast ratio results

Contrast ratio 135490:1
Monitor model
Submitted 11 Feb 2021 14:40 CET, by 120.29.*.*
Camera model Xiaomi M2007J3SG
Processing remarks

Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 94.7 s (Set EV to +12.9)

Black
Screen photo
Luminance 0 cd/m2
Luminance spread 0 cd/m2 (2 standard deviations)
Exposure value –15.39 stops   (aim for –2 to –3)
Exposure spread 0 stops
Area used for calculation 0.462 x 0.26
Camera settings Exposure time: 1/80   ISO: 400   F-number: 1.7
Focal length: 24 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 156 cd/m2
Luminance spread 5 cd/m2 (2 standard deviations)
Exposure value –0.55 stops   (aim for –2 to –3)
Exposure spread 0.05 stops
Area used for calculation 0.462 x 0.26
Camera settings Exposure time: 1/370   ISO: 400   F-number: 1.7
Focal length: 24 mm   (35 mm equivalent)
Exposure compensation: 1.17

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.