Contrast ratio results

Contrast ratio 1023:1
Monitor model
Submitted 13 Nov 2021 09:46 CET, by 201.147.*.*
Camera model Xiaomi Redmi Note 9S
Processing remarks


Black
Screen photo
Luminance 0.02 cd/m2
Luminance spread 0.01 cd/m2 (2 standard deviations)
Exposure value –1.93 stops   (aim for –2 to –3)
Exposure spread 0.54 stops
Area used for calculation 0.376 x 0.376
Camera settings Exposure time: 15   ISO: 200   F-number: 1.8
Focal length: 26 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 25 cd/m2
Luminance spread 3 cd/m2 (2 standard deviations)
Exposure value –2.16 stops   (aim for –2 to –3)
Exposure spread 0.18 stops
Area used for calculation 0.376 x 0.376
Camera settings Exposure time: 1/80   ISO: 200   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.