Contrast ratio results

Contrast ratio 156:1 (edge: 305:1)
Monitor model
Submitted 06 Jul 2010 10:53 CEST, by 80.98.*.*
Camera model Nikon COOLPIX L20
Processing remarks

Warning: image file 2: automatic white balance can cause inaccuracies.
image file 2: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.
Warning: image file 3: automatic white balance can cause inaccuracies.
Warning: Image ISO settings are not the same.

Black
Screen photo
Luminance 0.93 cd/m2
Luminance spread 0.4 cd/m2 (2 standard deviations)
Exposure value –2.73 stops   (aim for –2 to –3)
Exposure spread 0.63 stops
Area used for calculation 0.549 x 0.549
Camera settings Exposure time: 1/6   ISO: 800   F-number: 3.1
Focal length: 38 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 145 cd/m2
Luminance spread 42 cd/m2 (2 standard deviations)
Exposure value –2.32 stops   (aim for –2 to –3)
Exposure spread 0.42 stops
Area used for calculation 0.549 x 0.549
Camera settings Exposure time: 1/250   ISO: 282   F-number: 3.1
Focal length: 38 mm   (35 mm equivalent)
Exposure compensation: 0
Black at screen edge
Screen photo
Luminance 0.48 cd/m2
Luminance spread 0.36 cd/m2 (2 standard deviations)
Exposure value –2.11 stops   (aim for –2 to –3)
Exposure spread 1.14 stops
Area used for calculation 0.549 x 0.549
Camera settings Exposure time: 0.5   ISO: 800   F-number: 3.1
Focal length: 38 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.