Contrast ratio results for Samsung LN46A950

Black
Contrast ratio	157817:1 (edge: 136363:1)
Monitor model	Samsung LN46A950
Submitted	21 Jun 2009 19:12 CEST, by 70.70..
Camera model	Canon PowerShot A75
Processing remarks	image file 1: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time. Warning: image file 1: Underexposed. Please increase the shutter time. Note: image file 1: suggested exposure time: 89.4 s (Set EV to +4.5) Warning: image file 2: exposure time below 1/500 sec is unreliable. Try increasing the EV compensation. image file 2: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time. image file 3: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time. Warning: image file 3: Underexposed. Please increase the shutter time. Note: image file 3: suggested exposure time: 77.3 s (Set EV to +4.3)
Screen photo	[open image]
Luminance	0 cd/m2
Luminance spread	0 cd/m2 (2 standard deviations)
Exposure value	–8.98 stops (aim for –2 to –3)
Exposure spread	1.95 stops
Area used for calculation	0.5 x 0.5
Camera settings	Exposure time: 1 ISO: 400 F-number: 2.8 Focal length: 34.6 mm (35 mm equivalent) Exposure compensation: -2
White
Screen photo	[open image]
Luminance	523 cd/m2
Luminance spread	64 cd/m2 (2 standard deviations)
Exposure value	–2 stops (aim for –2 to –3)
Exposure spread	0.18 stops
Area used for calculation	0.5 x 0.5
Camera settings	Exposure time: 1/1244 ISO: 400 F-number: 2.8 Focal length: 34.6 mm (35 mm equivalent) Exposure compensation: -2
Black at screen edge
Screen photo	[open image]
Luminance	0 cd/m2
Luminance spread	0 cd/m2 (2 standard deviations)
Exposure value	–8.77 stops (aim for –2 to –3)
Exposure spread	1.9 stops
Area used for calculation	0.5 x 0.5
Camera settings	Exposure time: 1 ISO: 400 F-number: 2.8 Focal length: 34.6 mm (35 mm equivalent) Exposure compensation: -2

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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.