Contrast ratio results

Contrast ratio 246:1
Monitor model
Submitted 22 Jan 2019 20:51 CET, by 90.146.*.*
Camera model Canon EOS M50
Processing remarks

Warning: image file 1: could not determine angle of view; assuming 38 mm lens (35 mm equivalent).
Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 11.0 s (Set EV to +2.5)
Warning: image file 2: could not determine angle of view; assuming 38 mm lens (35 mm equivalent).
Warning: image file 2: Underexposed. Please increase the shutter time.
Note: image file 2: suggested exposure time: 1/22 s (Set EV to +4.5)

Black
Screen photo
Luminance 0.14 cd/m2
Luminance spread 0.03 cd/m2 (2 standard deviations)
Exposure value –4.96 stops   (aim for –2 to –3)
Exposure spread 0.27 stops
Area used for calculation 0.528 x 0.528
Camera settings Exposure time: 2   ISO: 400   F-number: 6.4
Focal length: 0 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 35 cd/m2
Luminance spread 6 cd/m2 (2 standard deviations)
Exposure value –7.02 stops   (aim for –2 to –3)
Exposure spread 0.26 stops
Area used for calculation 0.528 x 0.594
Camera settings Exposure time: 1/512   ISO: 400   F-number: 6.4
Focal length: 0 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.