Contrast ratio results

Contrast ratio 6876:1
Monitor model
Submitted 26 Sep 2021 04:17 CEST, by 99.238.*.*
Camera model Apple iPhone XR
Processing remarks

Warning: image file 1: automatic white balance can cause inaccuracies.
Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 6.1 s (Set EV to +2.6)
Warning: image file 2: automatic white balance can cause inaccuracies.

Black
Screen photo
Luminance 0.02 cd/m2
Luminance spread 0.01 cd/m2 (2 standard deviations)
Exposure value –5.11 stops   (aim for –2 to –3)
Exposure spread 1 stops
Area used for calculation 0.501 x 0.282
Camera settings Exposure time: 1   ISO: 400   F-number: 1.8
Focal length: 26 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 138 cd/m2
Luminance spread 4 cd/m2 (2 standard deviations)
Exposure value –0.81 stops   (aim for –2 to –3)
Exposure spread 0.04 stops
Area used for calculation 0.501 x 0.282
Camera settings Exposure time: 1/350   ISO: 400   F-number: 1.8
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.