Contrast ratio results

Contrast ratio 723401:1
Monitor model
Submitted 08 Apr 2021 14:45 CEST, by 111.125.*.*
Camera model HUAWEI EVA-L19
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.
image file 2: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.

Black
Screen photo
Luminance 119 cd/m2
Luminance spread 1384 cd/m2 (2 standard deviations)
Exposure value –23.05 stops   (aim for –2 to –3)
Exposure spread 4.25 stops
Area used for calculation 0.358 x 0.477
Camera settings Exposure time: 1/99996336   ISO: 400   F-number: 2.2
Focal length: 27 mm   (35 mm equivalent)
Exposure compensation: -1
White
Screen photo
Luminance 8.63533e+07 cd/m2
Luminance spread 5.3927e+07 cd/m2 (2 standard deviations)
Exposure value –3.58 stops   (aim for –2 to –3)
Exposure spread 0.93 stops
Area used for calculation 0.358 x 0.477
Camera settings Exposure time: 1/99996336   ISO: 400   F-number: 2.2
Focal length: 27 mm   (35 mm equivalent)
Exposure compensation: -1

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.