Contrast ratio results

Contrast ratio 4102:1
Monitor model
Submitted 03 Jan 2021 07:02 CET, by 176.67.*.*
Camera model Apple iPhone 7
Processing remarks

Warning: image file 2: exposure time below 1/500 sec is unreliable. Try increasing the EV compensation.
Warning: Image ISO settings are not the same.

Black
Screen photo
Luminance 0.25 cd/m2
Luminance spread 0.07 cd/m2 (2 standard deviations)
Exposure value –2.19 stops   (aim for –2 to –3)
Exposure spread 0.4 stops
Area used for calculation 0.404 x 0.404
Camera settings Exposure time: 0.3   ISO: 800   F-number: 1.8
Focal length: 28 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 1038 cd/m2
Luminance spread 103 cd/m2 (2 standard deviations)
Exposure value –2.16 stops   (aim for –2 to –3)
Exposure spread 0.14 stops
Area used for calculation 0.404 x 0.404
Camera settings Exposure time: 1/840   ISO: 50   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.