Contrast ratio results for Dell u2412m

Black
Contrast ratio	457:1
Monitor model	Dell u2412m
Submitted	15 Nov 2012 05:42 CET, by 206.248..
Camera model	Nikon D70s
Processing remarks	Warning: image file 1: Overexposed. Please decrease the shutter time. Note: image file 1: suggested exposure time: 4.2 s (Set EV to -1.8) Note: image file 2: suggested exposure time: 1/110 s (Set EV to -1.4)
Screen photo	[open image]
Luminance	0.11 cd/m2
Luminance spread	0.03 cd/m2 (2 standard deviations)
Exposure value	–0.66 stops (aim for –2 to –3)
Exposure spread	0.41 stops
Area used for calculation	0.375 x 0.423
Camera settings	Exposure time: 15 ISO: 400 F-number: 3.5 Focal length: 27 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	51 cd/m2
Luminance spread	3 cd/m2 (2 standard deviations)
Exposure value	–1.05 stops (aim for –2 to –3)
Exposure spread	0.1 stops
Area used for calculation	0.375 x 0.423
Camera settings	Exposure time: 1/40 ISO: 400 F-number: 3.5 Focal length: 27 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.