Contrast ratio results

Contrast ratio 228:1
Monitor model
Submitted 17 Feb 2008 10:25 CET, by 24.81.*.*
Camera model Sony DSC-W1
Processing remarks

Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 0.8 s (Set EV to +1.7)
Note: image file 2: suggested exposure time: 1/280 s (Set EV to -1.5)

Black
Screen photo
Luminance 0.36 cd/m2
Luminance spread 0.13 cd/m2 (2 standard deviations)
Exposure value –4.21 stops   (aim for –2 to –3)
Exposure spread 0.53 stops
Area used for calculation 0.55 x 0.55
Camera settings Exposure time: 1/4   ISO: 400   F-number: 2.8
Focal length: 38.2 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 83 cd/m2
Luminance spread 8 cd/m2 (2 standard deviations)
Exposure value –1.02 stops   (aim for –2 to –3)
Exposure spread 0.14 stops
Area used for calculation 0.55 x 0.55
Camera settings Exposure time: 1/100   ISO: 400   F-number: 2.8
Focal length: 38.2 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.