Contrast ratio results

Contrast ratio 3578:1
Monitor model
Submitted 13 Dec 2019 19:28 CET, by 87.155.*.*
Camera model Sony ILCE-6300
Processing remarks

Warning: image file 1: automatic white balance can cause inaccuracies.
Note: image file 1: suggested exposure time: 9.1 s (Set EV to +1.2)
Warning: image file 2: automatic white balance can cause inaccuracies.
Warning: image file 3: automatic white balance can cause inaccuracies.
Warning: image file 3 is too bright to be a dark photo. Maybe you mixed up the files?

Black
Screen photo
Luminance 0.07 cd/m2
Luminance spread 0.06 cd/m2 (2 standard deviations)
Exposure value –3.69 stops   (aim for –2 to –3)
Exposure spread 1.46 stops
Area used for calculation 0.375 x 0.423
Camera settings Exposure time: 4   ISO: 400   F-number: 4
Focal length: 27 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 237 cd/m2
Luminance spread 25 cd/m2 (2 standard deviations)
Exposure value –1.85 stops   (aim for –2 to –3)
Exposure spread 0.15 stops
Area used for calculation 0.375 x 0.423
Camera settings Exposure time: 1/250   ISO: 400   F-number: 4
Focal length: 27 mm   (35 mm equivalent)
Exposure compensation: 0
Black at screen edge
Screen photo
Luminance 237 cd/m2
Luminance spread 25 cd/m2 (2 standard deviations)
Exposure value –1.85 stops   (aim for –2 to –3)
Exposure spread 0.15 stops
Area used for calculation 0.375 x 0.423
Camera settings Exposure time: 1/250   ISO: 400   F-number: 4
Focal length: 27 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.