Contrast ratio results

Contrast ratio 866:1
Monitor model
Submitted 10 Jun 2010 21:00 CEST, by 121.203.*.*
Camera model Canon EOS 400D DIGITAL
Processing remarks

Warning: Image F-number settings are not the same.
Warning: Image focal lengths/zoom levels are not the same.

Black
Screen photo
Luminance 0.22 cd/m2
Luminance spread 0.07 cd/m2 (2 standard deviations)
Exposure value –2.9 stops   (aim for –2 to –3)
Exposure spread 0.43 stops
Area used for calculation 0.845 x 0.953
Camera settings Exposure time: 3.2   ISO: 400   F-number: 5
Focal length: 60.9 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 194 cd/m2
Luminance spread 68 cd/m2 (2 standard deviations)
Exposure value –3.16 stops   (aim for –2 to –3)
Exposure spread 0.51 stops
Area used for calculation 0.737 x 0.831
Camera settings Exposure time: 1/400   ISO: 400   F-number: 4.5
Focal length: 53.1 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.