Contrast ratio results

Black
Contrast ratio	25490:1
Monitor model
Submitted	13 Jun 2011 12:36 CEST, by 122.227..
Camera model	Nikon D80
Processing remarks	Warning: image file 1: automatic white balance can cause inaccuracies. Warning: image file 1: Underexposed. Please increase the shutter time. Note: image file 1: suggested exposure time: 191.9 s (Set EV to +7.6) Warning: image file 2: automatic white balance can cause inaccuracies.
Screen photo	[open image]
Luminance	0.01 cd/m2
Luminance spread	0.01 cd/m2 (2 standard deviations)
Exposure value	–10.08 stops (aim for –2 to –3)
Exposure spread	2.67 stops
Area used for calculation	0.501 x 0.561
Camera settings	Exposure time: 1 ISO: 400 F-number: 5.6 Focal length: 36 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	157 cd/m2
Luminance spread	32 cd/m2 (2 standard deviations)
Exposure value	–3.41 stops (aim for –2 to –3)
Exposure spread	0.3 stops
Area used for calculation	0.501 x 0.561
Camera settings	Exposure time: 1/250 ISO: 400 F-number: 5.6 Focal length: 36 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.