Contrast ratio results

Contrast ratio 1080:1 (edge: 1119:1)
Monitor model
Submitted 08 Jan 2012 13:00 CET, by 64.222.*.*
Camera model Canon PowerShot SD880 IS
Processing remarks

image file 1: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.
Note: image file 1: suggested exposure time: 2.6 s (Set EV to +1.4)
Note: image file 3: suggested exposure time: 2.7 s (Set EV to +1.5)

Black
Screen photo
Luminance 0.11 cd/m2
Luminance spread 0.02 cd/m2 (2 standard deviations)
Exposure value –3.9 stops   (aim for –2 to –3)
Exposure spread 0.28 stops
Area used for calculation 0.399 x 0.399
Camera settings Exposure time: 1   ISO: 400   F-number: 2.8
Focal length: 27.6 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 121 cd/m2
Luminance spread 35 cd/m2 (2 standard deviations)
Exposure value –1.8 stops   (aim for –2 to –3)
Exposure spread 0.42 stops
Area used for calculation 0.399 x 0.399
Camera settings Exposure time: 1/251   ISO: 400   F-number: 2.8
Focal length: 27.6 mm   (35 mm equivalent)
Exposure compensation: 0
Black at screen edge
Screen photo
Luminance 0.11 cd/m2
Luminance spread 0.04 cd/m2 (2 standard deviations)
Exposure value –3.96 stops   (aim for –2 to –3)
Exposure spread 0.48 stops
Area used for calculation 0.399 x 0.399
Camera settings Exposure time: 1   ISO: 400   F-number: 2.8
Focal length: 27.6 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.