Contrast ratio results for HP

Contrast ratio 717:1
Monitor model HP
Submitted 11 Sep 2019 00:24 CEST, by 213.149.*.*
Camera model LG Electronics LG-H870
Processing remarks

Warning: image file 1: could not determine angle of view; assuming 38 mm lens (35 mm equivalent).
Note: image file 1: suggested exposure time: 2.1 s (Set EV to +1.1)
Warning: image file 2: could not determine angle of view; assuming 38 mm lens (35 mm equivalent).

Black
Screen photo
Luminance 0.1 cd/m2
Luminance spread 0.07 cd/m2 (2 standard deviations)
Exposure value –3.57 stops   (aim for –2 to –3)
Exposure spread 0.94 stops
Area used for calculation 0.528 x 0.297
Camera settings Exposure time: 1   ISO: 400   F-number: 2.4
Focal length: 0 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 74 cd/m2
Luminance spread 9 cd/m2 (2 standard deviations)
Exposure value –2.73 stops   (aim for –2 to –3)
Exposure spread 0.17 stops
Area used for calculation 0.528 x 0.297
Camera settings Exposure time: 1/400   ISO: 400   F-number: 2.4
Focal length: 0 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.