Contrast ratio results

Contrast ratio 535:1
Monitor model
Submitted 20 Jul 2008 01:50 CEST, by 76.123.*.*
Camera model Canon PowerShot SD450
Processing remarks

Note: image file 1: suggested exposure time: 5.2 s (Set EV to -1.5)

Black
Screen photo
Luminance 0.46 cd/m2
Luminance spread 0.15 cd/m2 (2 standard deviations)
Exposure value –0.97 stops   (aim for –2 to –3)
Exposure spread 0.49 stops
Area used for calculation 0.497 x 0.497
Camera settings Exposure time: 15   ISO: 50   F-number: 2.8
Focal length: 34.4 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 244 cd/m2
Luminance spread 36 cd/m2 (2 standard deviations)
Exposure value –1.72 stops   (aim for –2 to –3)
Exposure spread 0.21 stops
Area used for calculation 0.497 x 0.497
Camera settings Exposure time: 1/60   ISO: 50   F-number: 2.8
Focal length: 34.4 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.