Contrast ratio results

Black
Contrast ratio	389:1 (edge: 220:1)
Monitor model
Submitted	08 Dec 2013 09:54 CET, by 58.99..
Camera model	Nikon D5100
Processing remarks	Warning: image file 1: automatic white balance can cause inaccuracies. Warning: image file 2: automatic white balance can cause inaccuracies. Warning: image file 3: automatic white balance can cause inaccuracies.
Screen photo	[open image]
Luminance	0.39 cd/m2
Luminance spread	0.31 cd/m2 (2 standard deviations)
Exposure value	–2.12 stops (aim for –2 to –3)
Exposure spread	1.22 stops
Area used for calculation	1 x 1
Camera settings	Exposure time: 4 ISO: 200 F-number: 4 Focal length: 75 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	153 cd/m2
Luminance spread	26 cd/m2 (2 standard deviations)
Exposure value	–2.16 stops (aim for –2 to –3)
Exposure spread	0.24 stops
Area used for calculation	1 x 1
Camera settings	Exposure time: 1/100 ISO: 200 F-number: 4 Focal length: 75 mm (35 mm equivalent) Exposure compensation: 0
Black at screen edge
Screen photo	[open image]
Luminance	0.7 cd/m2
Luminance spread	0.95 cd/m2 (2 standard deviations)
Exposure value	–1.98 stops (aim for –2 to –3)
Exposure spread	2.42 stops
Area used for calculation	1 x 1
Camera settings	Exposure time: 2.5 ISO: 200 F-number: 4 Focal length: 75 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.