Contrast ratio results

Contrast ratio 649:1
Monitor model
Submitted 29 Nov 2019 17:48 CET, by 92.2.*.*
Camera model LG Electronics LG-H930
Processing remarks

Warning: image file 1: could not determine angle of view; assuming 38 mm lens (35 mm equivalent).
Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 1.1 s (Set EV to -1.6)
Warning: image file 2: could not determine angle of view; assuming 38 mm lens (35 mm equivalent).

Black
Screen photo
Luminance 0.36 cd/m2
Luminance spread 0.18 cd/m2 (2 standard deviations)
Exposure value –5.94 stops   (aim for –2 to –3)
Exposure spread 0.73 stops
Area used for calculation 0.528 x 0.396
Camera settings Exposure time: 1/10   ISO: 100   F-number: 1.6
Focal length: 0 mm   (35 mm equivalent)
Exposure compensation: -5
White
Screen photo
Luminance 231 cd/m2
Luminance spread 17 cd/m2 (2 standard deviations)
Exposure value –1.92 stops   (aim for –2 to –3)
Exposure spread 0.1 stops
Area used for calculation 0.528 x 0.396
Camera settings Exposure time: 1/400   ISO: 100   F-number: 1.6
Focal length: 0 mm   (35 mm equivalent)
Exposure compensation: -5

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.