Contrast ratio results for dell

Black
Contrast ratio	172:1
Monitor model	dell
Submitted	21 Jan 2013 12:44 CET, by 79.114..
Camera model	Samsung Techwin KENOX S630 / Samsung S6
Processing remarks	Warning: image file 1: automatic white balance can cause inaccuracies. image file 1: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen. Warning: using the flash makes no sense. 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. Warning: image file 2: Overexposed. Please decrease the shutter time. Warning: image file 3: camera was zoomed in 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: Overexposed. Please decrease the shutter time. Warning: Image focal lengths/zoom levels are not the same. Warning: image file 3 is too bright to be a dark photo. Maybe you mixed up the files?
Screen photo	[open image]
Luminance	0.48 cd/m2
Luminance spread	0.99 cd/m2 (2 standard deviations)
Exposure value	–2.89 stops (aim for –2 to –3)
Exposure spread	4.25 stops
Area used for calculation	0.506 x 0.506
Camera settings	Exposure time: 0.3 ISO: 80 F-number: 1 Focal length: 35 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	83 cd/m2
Luminance spread	125 cd/m2 (2 standard deviations)
Exposure value	–1.85 stops (aim for –2 to –3)
Exposure spread	2.82 stops
Area used for calculation	0.506 x 0.506
Camera settings	Exposure time: 1/280 ISO: 80 F-number: 1 Focal length: 35 mm (35 mm equivalent) Exposure compensation: 0
Black at screen edge
Screen photo	[open image]
Luminance	32 cd/m2
Luminance spread	64 cd/m2 (2 standard deviations)
Exposure value	–2.25 stops (aim for –2 to –3)
Exposure spread	4.25 stops
Area used for calculation	1 x 1
Camera settings	Exposure time: 1/140 ISO: 80 F-number: 1 Focal length: 106 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.