Contrast ratio results

Contrast ratio 37:1
Monitor model
Submitted 07 May 2017 22:13 CEST, by 188.87.*.*
Camera model Canon EOS 100D
Processing remarks

Warning: image file 1: automatic white balance can cause inaccuracies.
image file 1: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen.
Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 0.3 s (Set EV to +3.1)
Warning: image file 2: automatic white balance can cause inaccuracies.
image file 2: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen.
Warning: image file 2: Overexposed. Please decrease the shutter time.
Note: image file 2: suggested exposure time: 1/110 s (Set EV to -2.4)

Black
Screen photo
Luminance 2.82 cd/m2
Luminance spread 27.53 cd/m2 (2 standard deviations)
Exposure value –5.56 stops   (aim for –2 to –3)
Exposure spread 4.25 stops
Area used for calculation 0.55 x 0.619
Camera settings Exposure time: 1/25   ISO: 400   F-number: 5
Focal length: 39.6 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 104 cd/m2
Luminance spread 59 cd/m2 (2 standard deviations)
Exposure value –0.11 stops   (aim for –2 to –3)
Exposure spread 0.84 stops
Area used for calculation 0.525 x 0.701
Camera settings Exposure time: 1/21   ISO: 400   F-number: 5
Focal length: 39.6 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.