Contrast ratio results

Contrast ratio 307:1
Monitor model
Submitted 15 Nov 2018 21:15 CET, by 31.182.*.*
Camera model samsung SM-G930F
Processing remarks

image file 1: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.
Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 4.4 s (Set EV to +4.7)
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.
Warning: image file 2: Underexposed. Please increase the shutter time.
Note: image file 2: suggested exposure time: 1/69 s (Set EV to +4.8)

Black
Screen photo
Luminance 0.02 cd/m2
Luminance spread 0.02 cd/m2 (2 standard deviations)
Exposure value –7.23 stops   (aim for –2 to –3)
Exposure spread 1.27 stops
Area used for calculation 0.361 x 0.406
Camera settings Exposure time: 1/6   ISO: 400   F-number: 1.7
Focal length: 26 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 8 cd/m2
Luminance spread 3 cd/m2 (2 standard deviations)
Exposure value –7.34 stops   (aim for –2 to –3)
Exposure spread 0.58 stops
Area used for calculation 0.372 x 0.382
Camera settings Exposure time: 1/1992   ISO: 400   F-number: 1.7
Focal length: 26 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.