Contrast ratio results

Contrast ratio 6034:1
Monitor model
Submitted 16 Aug 2019 00:14 CEST, by 93.100.*.*
Camera model Xiaomi Mi-4c
Processing remarks

Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 36.9 s (Set EV to +6.2)
Warning: Image ISO settings are not the same.

Black
Screen photo
Luminance 0.02 cd/m2
Luminance spread 0.02 cd/m2 (2 standard deviations)
Exposure value –8.71 stops   (aim for –2 to –3)
Exposure spread 1.81 stops
Area used for calculation 0.398 x 0.53
Camera settings Exposure time: 0.5   ISO: 100   F-number: 2
Focal length: 30 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 99 cd/m2
Luminance spread 18 cd/m2 (2 standard deviations)
Exposure value –2.11 stops   (aim for –2 to –3)
Exposure spread 0.27 stops
Area used for calculation 0.398 x 0.53
Camera settings Exposure time: 1/500   ISO: 400   F-number: 2
Focal length: 30 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.