Contrast ratio results

Contrast ratio 1062:1
Monitor model
Submitted 03 Sep 2010 12:40 CEST, by 84.212.*.*
Camera model Canon EOS 550D
Processing remarks

Warning: image file 1: camera was zoomed out too much.
Warning: image file 2: camera was zoomed out too much.
Warning: image file 2: exposure time below 1/500 sec is unreliable. Try increasing the EV compensation.

Black
Screen photo
Luminance 0.25 cd/m2
Luminance spread 0.02 cd/m2 (2 standard deviations)
Exposure value –3.04 stops   (aim for –2 to –3)
Exposure spread 0.09 stops
Area used for calculation 0.1 x 0.113
Camera settings Exposure time: 0.8   ISO: 400   F-number: 2.8
Focal length: 3.9 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 270 cd/m2
Luminance spread 42 cd/m2 (2 standard deviations)
Exposure value –2.04 stops   (aim for –2 to –3)
Exposure spread 0.23 stops
Area used for calculation 0.1 x 0.113
Camera settings Exposure time: 1/664   ISO: 400   F-number: 2.8
Focal length: 3.9 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.