Contrast ratio results

Contrast ratio 805:1
Monitor model
Submitted 10 Jun 2010 21:17 CEST, by 121.203.*.*
Camera model Canon EOS 400D DIGITAL
Processing remarks

Warning: Image focal lengths/zoom levels are not the same.

Black
Screen photo
Luminance 0.26 cd/m2
Luminance spread 0.06 cd/m2 (2 standard deviations)
Exposure value –2.07 stops   (aim for –2 to –3)
Exposure spread 0.36 stops
Area used for calculation 0.543 x 0.612
Camera settings Exposure time: 3.2   ISO: 400   F-number: 4
Focal length: 39.1 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 206 cd/m2
Luminance spread 58 cd/m2 (2 standard deviations)
Exposure value –2.73 stops   (aim for –2 to –3)
Exposure spread 0.41 stops
Area used for calculation 0.586 x 0.66
Camera settings Exposure time: 1/400   ISO: 400   F-number: 4
Focal length: 42.2 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.