Contrast ratio results

Contrast ratio 422:1
Monitor model
Submitted 17 Jan 2010 19:48 CET, by 213.98.*.*
Camera model Nikon D90
Processing remarks

Warning: image file 1: automatic white balance can cause inaccuracies.
Warning: image file 2: automatic white balance can cause inaccuracies.
Note: image file 2: suggested exposure time: 1/500 s (Set EV to -1.6)

Black
Screen photo
Luminance 0.55 cd/m2
Luminance spread 0.05 cd/m2 (2 standard deviations)
Exposure value –1.59 stops   (aim for –2 to –3)
Exposure spread 0.13 stops
Area used for calculation 0.347 x 0.392
Camera settings Exposure time: 1.6   ISO: 400   F-number: 3.5
Focal length: 25 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 230 cd/m2
Luminance spread 47 cd/m2 (2 standard deviations)
Exposure value –0.86 stops   (aim for –2 to –3)
Exposure spread 0.29 stops
Area used for calculation 0.347 x 0.392
Camera settings Exposure time: 1/160   ISO: 400   F-number: 3.5
Focal length: 25 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.