Contrast ratio results for unknown

Contrast ratio 3:1
Monitor model unknown
Submitted 16 Jun 2013 20:06 CEST, by 190.193.*.*
Camera model Nikon D7000
Processing remarks

Warning: image file 1: camera was zoomed in too much.
image file 1: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen.
Note: image file 1: suggested exposure time: 6.9 s (Set EV to +0.5)
Warning: image file 2: camera was zoomed in too much.
image file 2: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen.

Black
Screen photo
Luminance 2.67 cd/m2
Luminance spread 12.11 cd/m2 (2 standard deviations)
Exposure value –3.96 stops   (aim for –2 to –3)
Exposure spread 4.25 stops
Area used for calculation 1 x 1
Camera settings Exposure time: 2.5   ISO: 100   F-number: 11
Focal length: 157 mm   (35 mm equivalent)
Exposure compensation: -1
White
Screen photo
Luminance 7 cd/m2
Luminance spread 25 cd/m2 (2 standard deviations)
Exposure value –2.6 stops   (aim for –2 to –3)
Exposure spread 4.25 stops
Area used for calculation 1 x 1
Camera settings Exposure time: 2.5   ISO: 100   F-number: 11
Focal length: 157 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.