Contrast ratio results

Contrast ratio 597:1
Monitor model
Submitted 02 Apr 2011 21:30 CEST, by 93.153.*.*
Camera model Canon PowerShot G11
Processing remarks


Black
Screen photo
Luminance 0.27 cd/m2
Luminance spread 0.1 cd/m2 (2 standard deviations)
Exposure value –2.97 stops   (aim for –2 to –3)
Exposure spread 0.51 stops
Area used for calculation 0.906 x 0.906
Camera settings Exposure time: 3.2   ISO: 200   F-number: 4
Focal length: 62.7 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 162 cd/m2
Luminance spread 23 cd/m2 (2 standard deviations)
Exposure value –2.09 stops   (aim for –2 to –3)
Exposure spread 0.21 stops
Area used for calculation 0.906 x 0.906
Camera settings Exposure time: 1/101   ISO: 200   F-number: 4
Focal length: 62.7 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.