Contrast ratio results

Black
Contrast ratio	972:1
Monitor model
Submitted	23 Nov 2013 00:26 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: 1.0 s (Set EV to +3.0) Warning: image file 2: automatic white balance can cause inaccuracies. Note: image file 2: suggested exposure time: 1/490 s (Set EV to -1.6) Warning: Image ISO settings are not the same.
Screen photo	[open image]
Luminance	0.15 cd/m2
Luminance spread	0.2 cd/m2 (2 standard deviations)
Exposure value	–5.48 stops (aim for –2 to –3)
Exposure spread	2.27 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	146 cd/m2
Luminance spread	21 cd/m2 (2 standard deviations)
Exposure value	–0.87 stops (aim for –2 to –3)
Exposure spread	0.21 stops
Area used for calculation	0.393 x 0.393
Camera settings	Exposure time: 1/159 ISO: 400 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.