Contrast ratio results

Contrast ratio 278:1
Monitor model
Submitted 23 Feb 2008 01:09 CET, by 84.203.*.*
Camera model Canon PowerShot A610
Processing remarks

Warning: image file 1: image includes screen edges or something that's not a monitor. Hold the camera close to the screen.
Warning: image file 2: image includes screen edges or something that's not a monitor. Hold the camera close to the screen.
Warning: image file 2: Overexposed. Please decrease the shutter time.
Note: image file 2: suggested exposure time: 1/320 s (Set EV to -2.4)

Black
Screen photo
Luminance 0.34 cd/m2
Luminance spread 0.23 cd/m2 (2 standard deviations)
Exposure value –3.04 stops   (aim for –2 to –3)
Exposure spread 1.02 stops
Area used for calculation 0.5 x 0.5
Camera settings Exposure time: 0.6   ISO: 400   F-number: 2.8
Focal length: 34.3 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 95 cd/m2
Luminance spread 9 cd/m2 (2 standard deviations)
Exposure value –0.09 stops   (aim for –2 to –3)
Exposure spread 0.13 stops
Area used for calculation 0.5 x 0.5
Camera settings Exposure time: 1/60   ISO: 400   F-number: 2.8
Focal length: 34.3 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.