Contrast ratio of HP ZR24w

Contrast ratio 573:1
Monitor model HP ZR24w
Submitted 03 Apr 2010 07:00 CEST, by 209.6.*.*
Camera model Canon EOS 40D
Processing remarks


Black
Screen photo
Luminance 0.26 cd/m2
Luminance spread 0.08 cd/m2 (2 standard deviations)
Exposure value –2.34 stops   (aim for –2 to –3)
Exposure spread 0.45 stops
Area used for calculation 0.63 x 0.71
Camera settings Exposure time: 2   ISO: 400   F-number: 3.5
Focal length: 45.4 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 148 cd/m2
Luminance spread 68 cd/m2 (2 standard deviations)
Exposure value –2.8 stops   (aim for –2 to –3)
Exposure spread 0.67 stops
Area used for calculation 0.63 x 0.71
Camera settings Exposure time: 1/395   ISO: 400   F-number: 3.5
Focal length: 45.4 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.