Contrast ratio results

Contrast ratio 1074:1
Monitor model
Submitted 12 Apr 2008 00:17 CEST, by 88.195.*.*
Camera model Canon PowerShot G7
Processing remarks

Warning: image file 1: automatic white balance can cause inaccuracies.
Note: image file 1: suggested exposure time: 6.5 s (Set EV to -1.2)
Warning: image file 2: automatic white balance can cause inaccuracies.

Black
Screen photo
Luminance 0.17 cd/m2
Luminance spread 0.06 cd/m2 (2 standard deviations)
Exposure value –1.29 stops   (aim for –2 to –3)
Exposure spread 0.48 stops
Area used for calculation 0.495 x 0.495
Camera settings Exposure time: 15   ISO: 108   F-number: 2.8
Focal length: 34.3 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 181 cd/m2
Luminance spread 12 cd/m2 (2 standard deviations)
Exposure value –2.44 stops   (aim for –2 to –3)
Exposure spread 0.1 stops
Area used for calculation 0.495 x 0.495
Camera settings Exposure time: 1/159   ISO: 108   F-number: 2.8
Focal length: 34.3 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.