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Contrast ratio results for hp pavilion dv8t

Contrast ratio 1295:1
Monitor model hp pavilion dv8t
Submitted 15 Apr 2010 22:54 CEST, by 188.26.*.*
Camera model Canon EOS DIGITAL REBEL XTi
Processing remarks

Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 4.5 s (Set EV to +2.2)

Black
Screen photo
[open image]
Luminance 0.1 cd/m2
Luminance spread 0.04 cd/m2 (2 standard deviations)
Exposure value –4.66 stops   (aim for –2 to –3)
Exposure spread 0.54 stops
Area used for calculation 0.607 x 0.684
Camera settings Exposure time: 1   ISO: 400   F-number: 3.5
Focal length: 43.7 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 134 cd/m2
Luminance spread 42 cd/m2 (2 standard deviations)
Exposure value –2.96 stops   (aim for –2 to –3)
Exposure spread 0.46 stops
Area used for calculation 0.607 x 0.684
Camera settings Exposure time: 1/400   ISO: 400   F-number: 3.5
Focal length: 43.7 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.