Contrast ratio results

Contrast ratio 402:1
Monitor model
Submitted 14 Jul 2011 20:05 CEST, by 67.164.*.*
Camera model Canon EOS DIGITAL REBEL XSi
Processing remarks

Warning: image file 1: camera was zoomed out too much.
Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 4.6 s (Set EV to +2.2)
Warning: image file 2: camera was zoomed out too much.
Warning: image file 2: Underexposed. Please increase the shutter time.
Note: image file 2: suggested exposure time: 1/88 s (Set EV to +1.9)

Black
Screen photo
Luminance 0.18 cd/m2
Luminance spread 0.03 cd/m2 (2 standard deviations)
Exposure value –4.69 stops   (aim for –2 to –3)
Exposure spread 0.28 stops
Area used for calculation 0.1 x 0.113
Camera settings Exposure time: 1   ISO: 400   F-number: 4.6
Focal length: 3 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 70 cd/m2
Luminance spread 7 cd/m2 (2 standard deviations)
Exposure value –4.41 stops   (aim for –2 to –3)
Exposure spread 0.15 stops
Area used for calculation 0.1 x 0.113
Camera settings Exposure time: 1/332   ISO: 400   F-number: 4.6
Focal length: 3 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.