Contrast ratio results

Contrast ratio 3522:1
Monitor model
Submitted 09 Feb 2018 13:00 CET, by 49.148.*.*
Camera model samsung SM-J710GN
Processing remarks

Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 15.5 s (Set EV to +8.5)
image file 2: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.
Warning: Image ISO settings are not the same.

Black
Screen photo
Luminance 0 cd/m2
Luminance spread 0.01 cd/m2 (2 standard deviations)
Exposure value –11.04 stops   (aim for –2 to –3)
Exposure spread 3.65 stops
Area used for calculation 0.404 x 0.404
Camera settings Exposure time: 1/24   ISO: 800   F-number: 1.9
Focal length: 28 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 15 cd/m2
Luminance spread 6 cd/m2 (2 standard deviations)
Exposure value –1.58 stops   (aim for –2 to –3)
Exposure spread 0.59 stops
Area used for calculation 0.404 x 0.404
Camera settings Exposure time: 1/30   ISO: 200   F-number: 1.9
Focal length: 28 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.