Contrast ratio results

Contrast ratio 6680:1
Monitor model
Submitted 22 Jun 2021 11:01 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: 27.8 s (Set EV to +3.1)

Black
Screen photo
Luminance 0 cd/m2
Luminance spread 0.01 cd/m2 (2 standard deviations)
Exposure value –5.62 stops   (aim for –2 to –3)
Exposure spread 1.72 stops
Area used for calculation 0.361 x 0.361
Camera settings Exposure time: 3.2   ISO: 400   F-number: 1.9
Focal length: 25 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 33 cd/m2
Luminance spread 5 cd/m2 (2 standard deviations)
Exposure value –2.24 stops   (aim for –2 to –3)
Exposure spread 0.23 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.