Contrast ratio results

Black
Contrast ratio	1676:1 (edge: 1363:1)
Monitor model
Submitted	23 Nov 2013 00:39 CET, by 76.99..
Camera model	Canon PowerShot SD800 IS
Processing remarks	Warning: image file 1: automatic white balance can cause inaccuracies. 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: 1.1 s (Set EV to +3.1) Warning: image file 2: automatic white balance can cause inaccuracies. Warning: image file 3: automatic white balance can cause inaccuracies. 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: 0.9 s (Set EV to +2.8) Warning: Image ISO settings are not the same.
Screen photo	[open image]
Luminance	0.14 cd/m2
Luminance spread	0.18 cd/m2 (2 standard deviations)
Exposure value	–5.62 stops (aim for –2 to –3)
Exposure spread	2.33 stops
Area used for calculation	0.393 x 0.393
Camera settings	Exposure time: 1/8 ISO: 800 F-number: 2.8 Focal length: 27.2 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	229 cd/m2
Luminance spread	33 cd/m2 (2 standard deviations)
Exposure value	–0.88 stops (aim for –2 to –3)
Exposure spread	0.21 stops
Area used for calculation	0.393 x 0.393
Camera settings	Exposure time: 1/251 ISO: 400 F-number: 2.8 Focal length: 27.2 mm (35 mm equivalent) Exposure compensation: 0
Black at screen edge
Screen photo	[open image]
Luminance	0.17 cd/m2
Luminance spread	0.22 cd/m2 (2 standard deviations)
Exposure value	–5.32 stops (aim for –2 to –3)
Exposure spread	2.2 stops
Area used for calculation	0.393 x 0.393
Camera settings	Exposure time: 1/8 ISO: 800 F-number: 2.8 Focal length: 27.2 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.