Contrast ratio results

Contrast ratio 27825:1
Monitor model
Submitted 12 Nov 2017 05:26 CET, by 46.12.*.*
Camera model SAMSUNG GT-I9500
Processing remarks

Warning: image file 1: automatic white balance can cause inaccuracies.
Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 334.6 s (Set EV to +12.5)
Warning: image file 2: automatic white balance can cause inaccuracies.
Warning: image file 2: Overexposed. Please decrease the shutter time.
Note: image file 2: suggested exposure time: 1/83 s (Set EV to -2.3)

Black
Screen photo
Luminance 0 cd/m2
Luminance spread 0 cd/m2 (2 standard deviations)
Exposure value –14.97 stops   (aim for –2 to –3)
Exposure spread 2.24 stops
Area used for calculation 0.439 x 0.466
Camera settings Exposure time: 1/17   ISO: 1000   F-number: 2.2
Focal length: 31 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 6 cd/m2
Luminance spread 1 cd/m2 (2 standard deviations)
Exposure value –0.21 stops   (aim for –2 to –3)
Exposure spread 0.24 stops
Area used for calculation 0.442 x 0.459
Camera settings Exposure time: 1/17   ISO: 1000   F-number: 2.2
Focal length: 31 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.