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Contrast ratio results for LG R480 laptop

Contrast ratio 63:1
Monitor model LG R480 laptop
Submitted 22 Aug 2010 17:12 CEST, by 189.110.*.*
Camera model Hewlett-Packard HP DSC CB350
Processing remarks

Warning: image file 2: Underexposed. Please increase the shutter time.
Note: image file 2: suggested exposure time: 1/34 s (Set EV to +3.6)

Black
Screen photo
[open image]
Luminance 0.37 cd/m2
Luminance spread 0.8 cd/m2 (2 standard deviations)
Exposure value –3.4 stops   (aim for –2 to –3)
Exposure spread 4.25 stops
Area used for calculation 0.549 x 0.549
Camera settings Exposure time: 1   ISO: 200   F-number: 3
Focal length: 38 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 23 cd/m2
Luminance spread 7 cd/m2 (2 standard deviations)
Exposure value –6.06 stops   (aim for –2 to –3)
Exposure spread 0.45 stops
Area used for calculation 0.549 x 0.549
Camera settings Exposure time: 1/400   ISO: 200   F-number: 3
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.