Contrast ratio results

Contrast ratio 2.90554e+06:1
Monitor model
Submitted 03 Jul 2011 12:50 CEST, by 178.73.*.*
Camera model Nikon D50
Processing remarks

Warning: image file 1: automatic white balance can cause inaccuracies.
Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 8591.1 s (Set EV to +20.4)
Warning: image file 2: automatic white balance can cause inaccuracies.
Note: image file 2: suggested exposure time: 1/340 s (Set EV to -1.1)
Warning: image file 3: automatic white balance can cause inaccuracies.
image file 3: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen.
Warning: image file 3 is too bright to be a dark photo. Maybe you mixed up the files?

Black
Screen photo
Luminance 0 cd/m2
Luminance spread 0 cd/m2 (2 standard deviations)
Exposure value –22.89 stops   (aim for –2 to –3)
Exposure spread 4.25 stops
Area used for calculation 0.708 x 0.798
Camera settings Exposure time: 1/160   ISO: 800   F-number: 5
Focal length: 51 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 160 cd/m2
Luminance spread 36 cd/m2 (2 standard deviations)
Exposure value –1.42 stops   (aim for –2 to –3)
Exposure spread 0.33 stops
Area used for calculation 0.708 x 0.798
Camera settings Exposure time: 1/160   ISO: 800   F-number: 5
Focal length: 51 mm   (35 mm equivalent)
Exposure compensation: 0
Black at screen edge
Screen photo
Luminance 66 cd/m2
Luminance spread 133 cd/m2 (2 standard deviations)
Exposure value –2.69 stops   (aim for –2 to –3)
Exposure spread 4.25 stops
Area used for calculation 0.708 x 0.798
Camera settings Exposure time: 1/160   ISO: 800   F-number: 5
Focal length: 51 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.