Contrast ratio results

Contrast ratio 140:1
Monitor model
Submitted 31 Dec 2014 23:25 CET, by 216.165.*.*
Camera model Canon EOS REBEL T1i
Processing remarks

Note: image file 2: suggested exposure time: 1/200 s (Set EV to +1.0)

Black
Screen photo
Luminance 1.11 cd/m2
Luminance spread 1.78 cd/m2 (2 standard deviations)
Exposure value –2.02 stops   (aim for –2 to –3)
Exposure spread 3.17 stops
Area used for calculation 0.772 x 0.869
Camera settings Exposure time: 1   ISO: 400   F-number: 4.6
Focal length: 55.6 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 156 cd/m2
Luminance spread 39 cd/m2 (2 standard deviations)
Exposure value –3.52 stops   (aim for –2 to –3)
Exposure spread 0.36 stops
Area used for calculation 0.772 x 0.869
Camera settings Exposure time: 1/395   ISO: 400   F-number: 4.6
Focal length: 55.6 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.