Contrast ratio results

Contrast ratio 39356:1
Monitor model
Submitted 01 Sep 2021 13:30 CEST, by 93.47.*.*
Camera model HUAWEI COL-L29
Processing remarks

Warning: image file 1: exposure time below 1/500 sec is unreliable. Try increasing the EV compensation.
Warning: image file 1: Underexposed. Please increase the shutter time.
Warning: image file 2: exposure time below 1/500 sec is unreliable. Try increasing the EV compensation.
Warning: Image ISO settings are not the same.

Black
Screen photo
Luminance 4915 cd/m2
Luminance spread 8957 cd/m2 (2 standard deviations)
Exposure value –14.1 stops   (aim for –2 to –3)
Exposure spread 4.25 stops
Area used for calculation 0.52 x 0.292
Camera settings Exposure time: 1/99996336   ISO: 3200   F-number: 1.8
Focal length: 27 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 1.93429e+08 cd/m2
Luminance spread 1.44517e+07 cd/m2 (2 standard deviations)
Exposure value –1.16 stops   (aim for –2 to –3)
Exposure spread 0.11 stops
Area used for calculation 0.52 x 0.292
Camera settings Exposure time: 1/99996336   ISO: 640   F-number: 1.8
Focal length: 27 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.