Contrast ratio results

Contrast ratio 92:1
Monitor model
Submitted 23 Aug 2020 13:15 CEST, by 141.138.*.*
Camera model Xiaomi POCOPHONE F1
Processing remarks


Black
Screen photo
Luminance 0.72 cd/m2
Luminance spread 1.17 cd/m2 (2 standard deviations)
Exposure value –2.1 stops   (aim for –2 to –3)
Exposure spread 3.27 stops
Area used for calculation 0.289 x 0.289
Camera settings Exposure time: 1/4   ISO: 400   F-number: 1.9
Focal length: 20 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 66 cd/m2
Luminance spread 17 cd/m2 (2 standard deviations)
Exposure value –2.55 stops   (aim for –2 to –3)
Exposure spread 0.38 stops
Area used for calculation 0.289 x 0.289
Camera settings Exposure time: 1/500   ISO: 400   F-number: 1.9
Focal length: 20 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.