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Contrast ratio of HP ZR24W

Contrast ratio 595:1 (edge: 676:1)
Monitor model HP ZR24W
Submitted 08 Sep 2010 16:46 CEST, by 62.78.*.*
Camera model Canon EOS 400D DIGITAL
Processing remarks

Note: image file 3: suggested exposure time: 1.7 s (Set EV to +1.1)

Black
Screen photo
[open image]
Luminance 0.51 cd/m2
Luminance spread 0.54 cd/m2 (2 standard deviations)
Exposure value –3.41 stops   (aim for –2 to –3)
Exposure spread 1.7 stops
Area used for calculation 0.759 x 0.856
Camera settings Exposure time: 0.8   ISO: 400   F-number: 4.5
Focal length: 54.7 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 302 cd/m2
Luminance spread 131 cd/m2 (2 standard deviations)
Exposure value –2.84 stops   (aim for –2 to –3)
Exposure spread 0.64 stops
Area used for calculation 0.759 x 0.856
Camera settings Exposure time: 1/500   ISO: 400   F-number: 4.5
Focal length: 54.7 mm   (35 mm equivalent)
Exposure compensation: 0
Black at screen edge
Screen photo
[open image]
Luminance 0.45 cd/m2
Luminance spread 0.31 cd/m2 (2 standard deviations)
Exposure value –3.6 stops   (aim for –2 to –3)
Exposure spread 1.03 stops
Area used for calculation 0.759 x 0.856
Camera settings Exposure time: 0.8   ISO: 400   F-number: 4.5
Focal length: 54.7 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.