Contrast ratio results

Contrast ratio 2536:1
Monitor model
Submitted 22 Jun 2008 23:43 CEST, by 87.194.*.*
Camera model Canon PowerShot G3
Processing remarks

image file 1: Note: 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: 12.4 s (Set EV to +2.4)
Warning: image file 2: Overexposed. Please decrease the shutter time.
Note: image file 2: suggested exposure time: 1/210 s (Set EV to -0.4)

Black
Screen photo
Luminance 0.1 cd/m2
Luminance spread 0.02 cd/m2 (2 standard deviations)
Exposure value –6.87 stops   (aim for –2 to –3)
Exposure spread 0.34 stops
Area used for calculation 0.494 x 0.494
Camera settings Exposure time: 0.6   ISO: 100   F-number: 2.8
Focal length: 34.2 mm   (35 mm equivalent)
Exposure compensation: -2
White
Screen photo
Luminance 243 cd/m2
Luminance spread 8 cd/m2 (2 standard deviations)
Exposure value –0.14 stops   (aim for –2 to –3)
Exposure spread 0.05 stops
Area used for calculation 0.494 x 0.494
Camera settings Exposure time: 1/40   ISO: 100   F-number: 2.8
Focal length: 34.2 mm   (35 mm equivalent)
Exposure compensation: 2

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.