Contrast ratio results

Contrast ratio 181:1
Monitor model
Submitted 09 Feb 2017 20:58 CET, by 109.230.*.*
Camera model Canon EOS DIGITAL REBEL XTi
Processing remarks

Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 6.1 s (Set EV to +0.9)
Warning: image file 2: Underexposed. Please increase the shutter time.
Note: image file 2: suggested exposure time: 1/30 s (Set EV to +2.1)

Black
Screen photo
Luminance 0.08 cd/m2
Luminance spread 0.04 cd/m2 (2 standard deviations)
Exposure value –4.43 stops   (aim for –2 to –3)
Exposure spread 0.72 stops
Area used for calculation 0.39 x 0.44
Camera settings Exposure time: 1.6   ISO: 400   F-number: 3.5
Focal length: 28.1 mm   (35 mm equivalent)
Exposure compensation: -1
White
Screen photo
Luminance 14 cd/m2
Luminance spread 21 cd/m2 (2 standard deviations)
Exposure value –5.57 stops   (aim for –2 to –3)
Exposure spread 2.82 stops
Area used for calculation 0.39 x 0.44
Camera settings Exposure time: 1/250   ISO: 400   F-number: 3.5
Focal length: 28.1 mm   (35 mm equivalent)
Exposure compensation: -1

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.