Contrast ratio results

Contrast ratio 704:1
Monitor model
Submitted 28 Aug 2010 12:37 CEST, by 80.31.*.*
Camera model Canon EOS 550D
Processing remarks

Warning: image file 1: camera was zoomed out too much.
Note: image file 1: suggested exposure time: 1.3 s (Set EV to +1.4)
Warning: image file 2: camera was zoomed out too much.

Black
Screen photo
Luminance 0.35 cd/m2
Luminance spread 0.07 cd/m2 (2 standard deviations)
Exposure value –3.9 stops   (aim for –2 to –3)
Exposure spread 0.31 stops
Area used for calculation 0.1 x 0.113
Camera settings Exposure time: 0.5   ISO: 400   F-number: 3.5
Focal length: 1.4 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 247 cd/m2
Luminance spread 21 cd/m2 (2 standard deviations)
Exposure value –1.81 stops   (aim for –2 to –3)
Exposure spread 0.12 stops
Area used for calculation 0.1 x 0.113
Camera settings Exposure time: 1/332   ISO: 400   F-number: 3.5
Focal length: 1.4 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.