Contrast ratio results

Contrast ratio 374:1
Monitor model
Submitted 15 May 2020 21:29 CEST, by 76.101.*.*
Camera model Apple iPhone 7
Processing remarks

Warning: image file 2: Overexposed. Please decrease the shutter time.

Black
Screen photo
Luminance 0.71 cd/m2
Luminance spread 0.06 cd/m2 (2 standard deviations)
Exposure value –1.96 stops   (aim for –2 to –3)
Exposure spread 0.13 stops
Area used for calculation 0.404 x 0.404
Camera settings Exposure time: 1/4   ISO: 400   F-number: 1.8
Focal length: 28 mm   (35 mm equivalent)
Exposure compensation: -1.4
White
Screen photo
Luminance 266 cd/m2
Luminance spread 0 cd/m2 (2 standard deviations)
Exposure value –-0 stops   (aim for –2 to –3)
Exposure spread 0 stops
Area used for calculation 0.404 x 0.404
Camera settings Exposure time: 1/384   ISO: 400   F-number: 1.8
Focal length: 28 mm   (35 mm equivalent)
Exposure compensation: -1.4

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.