Contrast ratio results

Contrast ratio 461:1
Monitor model
Submitted 25 Feb 2008 11:02 CET, by 66.188.*.*
Camera model Canon EOS 40D
Processing remarks

Warning: image file 1: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.
Warning: image file 2: exposure time below 1/500 sec is unreliable. Try increasing the EV compensation.
Warning: image file 2: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.

Black
Screen photo
Luminance 1.03 cd/m2
Luminance spread 1.63 cd/m2 (2 standard deviations)
Exposure value –2.7 stops   (aim for –2 to –3)
Exposure spread 3.08 stops
Area used for calculation 0.43 x 0.48
Camera settings Exposure time: 1/4   ISO: 400   F-number: 2.8
Focal length: 30.8 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 475 cd/m2
Luminance spread 178 cd/m2 (2 standard deviations)
Exposure value –1.48 stops   (aim for –2 to –3)
Exposure spread 0.55 stops
Area used for calculation 0.43 x 0.48
Camera settings Exposure time: 1/790   ISO: 400   F-number: 2.8
Focal length: 30.8 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.