Contrast ratio results for 20WMGX2

Black
Contrast ratio	644:1
Monitor model	20WMGX2
Submitted	19 Feb 2008 05:22 CET, by 24.251..
Camera model	Canon EOS 40D
Processing remarks	Warning: image file 1: camera was zoomed in too much. Warning: image file 1: automatic white balance can cause inaccuracies. Warning: image file 2: camera was zoomed in too much. Warning: image file 2: automatic white balance can cause inaccuracies.
Screen photo	[open image]
Luminance	0.28 cd/m2
Luminance spread	0.07 cd/m2 (2 standard deviations)
Exposure value	–2.22 stops (aim for –2 to –3)
Exposure spread	0.39 stops
Area used for calculation	1 x 1
Camera settings	Exposure time: 1.3 ISO: 400 F-number: 2.8 Focal length: 89.1 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	178 cd/m2
Luminance spread	70 cd/m2 (2 standard deviations)
Exposure value	–2.27 stops (aim for –2 to –3)
Exposure spread	0.57 stops
Area used for calculation	1 x 1
Camera settings	Exposure time: 1/512 ISO: 400 F-number: 2.8 Focal length: 89.1 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.