Contrast ratio of HP ZR24W

Black
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)
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

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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.