Contrast ratio results

Contrast ratio 3091:1
Monitor model
Submitted 03 Jan 2021 08:24 CET, by 176.67.*.*
Camera model Apple iPhone 7
Processing remarks

Warning: image file 2: Overexposed. Please decrease the shutter time.
Warning: Image ISO settings are not the same.

Black
Screen photo
Luminance 0.26 cd/m2
Luminance spread 0.03 cd/m2 (2 standard deviations)
Exposure value –2.41 stops   (aim for –2 to –3)
Exposure spread 0.15 stops
Area used for calculation 0.458 x 0.343
Camera settings Exposure time: 1/4   ISO: 800   F-number: 1.8
Focal length: 28 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 807 cd/m2
Luminance spread 62 cd/m2 (2 standard deviations)
Exposure value –0.14 stops   (aim for –2 to –3)
Exposure spread 0.11 stops
Area used for calculation 0.458 x 0.343
Camera settings Exposure time: 1/320   ISO: 100   F-number: 1.8
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.