Contrast ratio results for Dell U2212HM

Black
Contrast ratio	704:1
Monitor model	Dell U2212HM
Submitted	04 Dec 2015 02:07 CET, by 71.230..
Camera model	Canon EOS REBEL T3i
Processing remarks	Warning: image file 1: could not determine angle of view; assuming 38 mm lens (35 mm equivalent). image file 1: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen. Warning: image file 2: could not determine angle of view; assuming 38 mm lens (35 mm equivalent). image file 2: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen.
Screen photo	[open image]
Luminance	0.2 cd/m2
Luminance spread	0.14 cd/m2 (2 standard deviations)
Exposure value	–3.03 stops (aim for –2 to –3)
Exposure spread	1.04 stops
Area used for calculation	0.528 x 0.528
Camera settings	Exposure time: 1.6 ISO: 400 F-number: 3.5 Focal length: 0 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	141 cd/m2
Luminance spread	32 cd/m2 (2 standard deviations)
Exposure value	–2.24 stops (aim for –2 to –3)
Exposure spread	0.33 stops
Area used for calculation	0.528 x 0.528
Camera settings	Exposure time: 1/256 ISO: 400 F-number: 3.5 Focal length: 0 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.