Contrast ratio results

Black
Contrast ratio	351:1
Monitor model
Submitted	15 Jan 2012 11:19 CET, by 82.103..
Camera model	SAMSUNG NX10
Processing remarks	Warning: image file 1: automatic white balance can cause inaccuracies. Note: image file 1: suggested exposure time: 2.0 s (Set EV to +1.0) Warning: image file 2: automatic white balance can cause inaccuracies. image file 2: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen. Note: image file 2: suggested exposure time: 1/170 s (Set EV to +1.2)
Screen photo	[open image]
Luminance	0.3 cd/m2
Luminance spread	0.14 cd/m2 (2 standard deviations)
Exposure value	–3.51 stops (aim for –2 to –3)
Exposure spread	0.71 stops
Area used for calculation	0.358 x 0.477
Camera settings	Exposure time: 1 ISO: 400 F-number: 4 Focal length: 27 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	106 cd/m2
Luminance spread	53 cd/m2 (2 standard deviations)
Exposure value	–3.7 stops (aim for –2 to –3)
Exposure spread	0.73 stops
Area used for calculation	0.358 x 0.477
Camera settings	Exposure time: 1/400 ISO: 400 F-number: 4 Focal length: 27 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.