Contrast ratio results

Contrast ratio 2:1
Monitor model
Submitted 07 Oct 2018 10:59 CEST, by 5.11.*.*
Camera model Xiaomi MI 6
Processing remarks

Warning: image file 1: automatic white balance can cause inaccuracies.
image file 1: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.
Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 1/19 s (Set EV to +4.8)
Warning: image file 2: automatic white balance can cause inaccuracies.
image file 2: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.
Warning: image file 2: Underexposed. Please increase the shutter time.
Note: image file 2: suggested exposure time: 1/30 s (Set EV to +4.1)

Black
Screen photo
Luminance 2.27 cd/m2
Luminance spread 3.52 cd/m2 (2 standard deviations)
Exposure value –7.25 stops   (aim for –2 to –3)
Exposure spread 2.99 stops
Area used for calculation 0.358 x 0.477
Camera settings Exposure time: 1/500   ISO: 400   F-number: 1.8
Focal length: 27 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 3.63 cd/m2
Luminance spread 2.36 cd/m2 (2 standard deviations)
Exposure value –6.57 stops   (aim for –2 to –3)
Exposure spread 0.97 stops
Area used for calculation 0.358 x 0.477
Camera settings Exposure time: 1/500   ISO: 400   F-number: 1.8
Focal length: 27 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.