Contrast ratio results for Philips 220WS

Contrast ratio 856:1
Monitor model Philips 220WS
Submitted 17 Feb 2008 19:28 CET, by 89.122.*.*
Camera model Canon PowerShot A630
Processing remarks

Warning: image file 1: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.
Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 1.7 s (Set EV to +1.8)
Warning: image file 2: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.

Black
Screen photo
Luminance 0.17 cd/m2
Luminance spread 0.04 cd/m2 (2 standard deviations)
Exposure value –4.26 stops   (aim for –2 to –3)
Exposure spread 0.32 stops
Area used for calculation 0.49 x 0.49
Camera settings Exposure time: 0.5   ISO: 408   F-number: 2.8
Focal length: 33.9 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 147 cd/m2
Luminance spread 23 cd/m2 (2 standard deviations)
Exposure value –2.49 stops   (aim for –2 to –3)
Exposure spread 0.23 stops
Area used for calculation 0.49 x 0.49
Camera settings Exposure time: 1/501   ISO: 408   F-number: 2.8
Focal length: 33.9 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.