Contrast ratio results

Contrast ratio 2125:1
Monitor model
Submitted 08 Nov 2010 13:29 CET, by 89.136.*.*
Camera model Canon PowerShot A430
Processing remarks

Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 48.3 s (Set EV to +5.6)

Black
Screen photo
Luminance 0.02 cd/m2
Luminance spread 0.01 cd/m2 (2 standard deviations)
Exposure value –8.09 stops   (aim for –2 to –3)
Exposure spread 0.45 stops
Area used for calculation 0.553 x 0.553
Camera settings Exposure time: 1   ISO: 100   F-number: 2.8
Focal length: 38.3 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 52 cd/m2
Luminance spread 6 cd/m2 (2 standard deviations)
Exposure value –1.95 stops   (aim for –2 to –3)
Exposure spread 0.17 stops
Area used for calculation 0.553 x 0.553
Camera settings Exposure time: 1/30   ISO: 100   F-number: 2.8
Focal length: 38.3 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.