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Contrast ratio results for ACER 22"

Contrast ratio 1:1
Monitor model ACER 22"
Submitted 24 Feb 2010 08:43 CET, by 65.31.*.*
Camera model Nikon COOLPIX P90
Processing remarks

Warning: image file 3 is too bright to be a dark photo. Maybe you mixed up the files?

Black
Screen photo
[open image]
Luminance 0.12 cd/m2
Luminance spread 0.03 cd/m2 (2 standard deviations)
Exposure value –2.4 stops   (aim for –2 to –3)
Exposure spread 0.37 stops
Area used for calculation 0.838 x 0.838
Camera settings Exposure time: 5.3   ISO: 400   F-number: 4
Focal length: 58 mm   (35 mm equivalent)
Exposure compensation: -1
White
Screen photo
[open image]
Luminance 0.15 cd/m2
Luminance spread 0.04 cd/m2 (2 standard deviations)
Exposure value –2.33 stops   (aim for –2 to –3)
Exposure spread 0.41 stops
Area used for calculation 0.838 x 0.838
Camera settings Exposure time: 4.4   ISO: 400   F-number: 4
Focal length: 58 mm   (35 mm equivalent)
Exposure compensation: -1
Black at screen edge
Screen photo
[open image]
Luminance 141 cd/m2
Luminance spread 17 cd/m2 (2 standard deviations)
Exposure value –1.78 stops   (aim for –2 to –3)
Exposure spread 0.18 stops
Area used for calculation 0.838 x 0.838
Camera settings Exposure time: 1/142   ISO: 400   F-number: 4
Focal length: 58 mm   (35 mm equivalent)
Exposure compensation: -1

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.