Contrast ratio results for dell

Contrast ratio 783:1
Monitor model dell
Submitted 18 Oct 2018 02:26 CEST, by 216.26.*.*
Camera model samsung SM-G960W
Processing remarks

Warning: image file 1: automatic white balance can cause inaccuracies.
Warning: image file 2: automatic white balance can cause inaccuracies.
Warning: image file 2: Overexposed. Please decrease the shutter time.
Warning: image file 3: automatic white balance can cause inaccuracies.
image file 3: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen.
Warning: image file 3 is too bright to be a dark photo. Maybe you mixed up the files?

Black
Screen photo
Luminance 0.23 cd/m2
Luminance spread 0.04 cd/m2 (2 standard deviations)
Exposure value –3.03 stops   (aim for –2 to –3)
Exposure spread 0.25 stops
Area used for calculation 0.425 x 0.319
Camera settings Exposure time: 1/4   ISO: 400   F-number: 1.5
Focal length: 26 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 184 cd/m2
Luminance spread 13 cd/m2 (2 standard deviations)
Exposure value –0.39 stops   (aim for –2 to –3)
Exposure spread 0.11 stops
Area used for calculation 0.425 x 0.319
Camera settings Exposure time: 1/500   ISO: 400   F-number: 1.5
Focal length: 26 mm   (35 mm equivalent)
Exposure compensation: 0
Black at screen edge
Screen photo
Luminance 68 cd/m2
Luminance spread 167 cd/m2 (2 standard deviations)
Exposure value –1.83 stops   (aim for –2 to –3)
Exposure spread 4.25 stops
Area used for calculation 0.425 x 0.319
Camera settings Exposure time: 1/500   ISO: 400   F-number: 1.5
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.