Contrast ratio results

Contrast ratio 848:1
Monitor model
Submitted 26 Apr 2010 15:26 CEST, by 124.171.*.*
Camera model Canon PowerShot G9
Processing remarks

Note: image file 1: suggested exposure time: 2.1 s (Set EV to +5.1)

Black
Screen photo
Luminance 0.14 cd/m2
Luminance spread 0.02 cd/m2 (2 standard deviations)
Exposure value –3.56 stops   (aim for –2 to –3)
Exposure spread 0.24 stops
Area used for calculation 0.488 x 0.488
Camera settings Exposure time: 1   ISO: 400   F-number: 2.8
Focal length: 33.8 mm   (35 mm equivalent)
Exposure compensation: 4
White
Screen photo
Luminance 120 cd/m2
Luminance spread 16 cd/m2 (2 standard deviations)
Exposure value –2.49 stops   (aim for –2 to –3)
Exposure spread 0.19 stops
Area used for calculation 0.488 x 0.488
Camera settings Exposure time: 1/403   ISO: 400   F-number: 2.8
Focal length: 33.8 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.