Contrast ratio results

Contrast ratio 727:1 (edge: 894:1)
Monitor model
Submitted 07 Aug 2011 09:46 CEST, by 187.156.*.*
Camera model Panasonic DMC-GF1
Processing remarks


Black
Screen photo
Luminance 0.27 cd/m2
Luminance spread 0.08 cd/m2 (2 standard deviations)
Exposure value –1.96 stops   (aim for –2 to –3)
Exposure spread 0.41 stops
Area used for calculation 0.402 x 0.454
Camera settings Exposure time: 2.5   ISO: 400   F-number: 3.5
Focal length: 29 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 195 cd/m2
Luminance spread 43 cd/m2 (2 standard deviations)
Exposure value –2.42 stops   (aim for –2 to –3)
Exposure spread 0.32 stops
Area used for calculation 0.402 x 0.454
Camera settings Exposure time: 1/400   ISO: 400   F-number: 3.5
Focal length: 29 mm   (35 mm equivalent)
Exposure compensation: 0
Black at screen edge
Screen photo
Luminance 0.22 cd/m2
Luminance spread 0.09 cd/m2 (2 standard deviations)
Exposure value –1.9 stops   (aim for –2 to –3)
Exposure spread 0.58 stops
Area used for calculation 0.402 x 0.454
Camera settings Exposure time: 3.2   ISO: 400   F-number: 3.5
Focal length: 29 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.