Contrast ratio results for NEC EA231WMi

Black
Contrast ratio	1892:1
Monitor model	NEC EA231WMi
Submitted	12 Feb 2011 15:06 CET, by 207.119..
Camera model	Canon EOS REBEL T2i
Processing remarks	Warning: image file 1: camera was zoomed out too much. Warning: image file 1: automatic white balance can cause inaccuracies. image file 1: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time. Warning: image file 1: Underexposed. Please increase the shutter time. Note: image file 1: suggested exposure time: 2.4 s (Set EV to +1.6) Warning: image file 2: camera was zoomed out too much. Warning: image file 2: automatic white balance can cause inaccuracies. image file 2: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time. Warning: image file 3: camera was zoomed out too much. Warning: image file 3: automatic white balance can cause inaccuracies. image file 3: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen. Warning: image file 3 is too bright to be a dark photo. Maybe you mixed up the files?
Screen photo	[open image]
Luminance	0.2 cd/m2
Luminance spread	0.14 cd/m2 (2 standard deviations)
Exposure value	–4.06 stops (aim for –2 to –3)
Exposure spread	1.12 stops
Area used for calculation	0.1 x 0.113
Camera settings	Exposure time: 0.8 ISO: 400 F-number: 3.5 Focal length: 1.4 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	370 cd/m2
Luminance spread	9 cd/m2 (2 standard deviations)
Exposure value	–1.48 stops (aim for –2 to –3)
Exposure spread	0.03 stops
Area used for calculation	0.1 x 0.113
Camera settings	Exposure time: 1/395 ISO: 400 F-number: 3.5 Focal length: 1.4 mm (35 mm equivalent) Exposure compensation: 0
Black at screen edge
Screen photo	[open image]
Luminance	93 cd/m2
Luminance spread	177 cd/m2 (2 standard deviations)
Exposure value	–1.49 stops (aim for –2 to –3)
Exposure spread	4.25 stops
Area used for calculation	0.1 x 0.113
Camera settings	Exposure time: 1/99 ISO: 400 F-number: 3.5 Focal length: 1.4 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.