Contrast ratio results

Black
Contrast ratio	13:1
Monitor model
Submitted	12 Jul 2013 12:14 CEST, by 79.114..
Camera model	Nikon D300
Processing remarks	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 1: Underexposed. Please increase the shutter time. Note: image file 1: suggested exposure time: 1/25 s (Set EV to +4.0) image file 2: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen. image file 3: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen. Note: image file 3: suggested exposure time: 1/190 s (Set EV to +1.0) Warning: image file 3 is too bright to be a dark photo. Maybe you mixed up the files?
Screen photo	[open image]
Luminance	7 cd/m2
Luminance spread	63 cd/m2 (2 standard deviations)
Exposure value	–6.5 stops (aim for –2 to –3)
Exposure spread	4.25 stops
Area used for calculation	1 x 1
Camera settings	Exposure time: 1/400 ISO: 400 F-number: 2.8 Focal length: 75 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	97 cd/m2
Luminance spread	183 cd/m2 (2 standard deviations)
Exposure value	–2.78 stops (aim for –2 to –3)
Exposure spread	4.25 stops
Area used for calculation	1 x 1
Camera settings	Exposure time: 1/400 ISO: 400 F-number: 2.8 Focal length: 75 mm (35 mm equivalent) Exposure compensation: 0
Black at screen edge
Screen photo	[open image]
Luminance	58 cd/m2
Luminance spread	161 cd/m2 (2 standard deviations)
Exposure value	–3.54 stops (aim for –2 to –3)
Exposure spread	4.25 stops
Area used for calculation	1 x 1
Camera settings	Exposure time: 1/400 ISO: 400 F-number: 2.8 Focal length: 75 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.