Contrast ratio results for LG 20MK400

Contrast ratio 637:1
Monitor model LG 20MK400
Submitted 30 Sep 2023 00:32 CEST, by 181.199.*.*
Camera model Xiaomi M2004J19C
Processing remarks

Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 2.9 s (Set EV to +5.8)

Black
Screen photo
Luminance 0.06 cd/m2
Luminance spread 0.15 cd/m2 (2 standard deviations)
Exposure value –8.34 stops   (aim for –2 to –3)
Exposure spread 4.25 stops
Area used for calculation 0.52 x 0.292
Camera settings Exposure time: 1/20   ISO: 400   F-number: 2.2
Focal length: 27 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 41 cd/m2
Luminance spread 3 cd/m2 (2 standard deviations)
Exposure value –3.34 stops   (aim for –2 to –3)
Exposure spread 0.1 stops
Area used for calculation 0.52 x 0.292
Camera settings Exposure time: 1/400   ISO: 400   F-number: 2.2
Focal length: 27 mm   (35 mm equivalent)
Exposure compensation: 0
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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.