Contrast ratio results

Contrast ratio 2406:1 (edge: 582:1)
Monitor model
Submitted 16 Nov 2017 21:33 CET, by 151.74.*.*
Camera model Canon EOS 1200D
Processing remarks

Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 4.7 s (Set EV to +4.2)
image file 3: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.
Warning: image file 3: Underexposed. Please increase the shutter time.
Note: image file 3: suggested exposure time: 1.1 s (Set EV to +2.2)

Black
Screen photo
Luminance 0.1 cd/m2
Luminance spread 0.06 cd/m2 (2 standard deviations)
Exposure value –6.72 stops   (aim for –2 to –3)
Exposure spread 0.84 stops
Area used for calculation 0.393 x 0.442
Camera settings Exposure time: 1/4   ISO: 400   F-number: 3.5
Focal length: 28.3 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 239 cd/m2
Luminance spread 70 cd/m2 (2 standard deviations)
Exposure value –2.11 stops   (aim for –2 to –3)
Exposure spread 0.43 stops
Area used for calculation 0.393 x 0.442
Camera settings Exposure time: 1/395   ISO: 400   F-number: 3.5
Focal length: 28.3 mm   (35 mm equivalent)
Exposure compensation: 0
Black at screen edge
Screen photo
Luminance 0.41 cd/m2
Luminance spread 2.36 cd/m2 (2 standard deviations)
Exposure value –4.67 stops   (aim for –2 to –3)
Exposure spread 4.25 stops
Area used for calculation 0.393 x 0.442
Camera settings Exposure time: 1/4   ISO: 400   F-number: 3.5
Focal length: 28.3 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.