Contrast ratio results

Contrast ratio 226:1
Monitor model
Submitted 27 Feb 2008 18:18 CET, by 82.215.*.*
Camera model Canon PowerShot S3 IS
Processing remarks

Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 5.7 s (Set EV to +2.5)
Warning: image file 2: Underexposed. Please increase the shutter time.
Note: image file 2: suggested exposure time: 1/40 s (Set EV to +3.3)

Black
Screen photo
Luminance 0.24 cd/m2
Luminance spread 0.07 cd/m2 (2 standard deviations)
Exposure value –5 stops   (aim for –2 to –3)
Exposure spread 0.42 stops
Area used for calculation 0.51 x 0.51
Camera settings Exposure time: 1   ISO: 80   F-number: 2.7
Focal length: 35.5 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 55 cd/m2
Luminance spread 10 cd/m2 (2 standard deviations)
Exposure value –5.84 stops   (aim for –2 to –3)
Exposure spread 0.27 stops
Area used for calculation 0.51 x 0.51
Camera settings Exposure time: 1/403   ISO: 80   F-number: 2.7
Focal length: 35.5 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.