Contrast ratio results

Contrast ratio 2165:1
Monitor model
Submitted 07 Dec 2013 09:37 CET, by 76.99.*.*
Camera model Canon PowerShot SD800 IS
Processing remarks

Warning: image file 1: camera was zoomed in too much.
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: 25.1 s (Set EV to +4.7)
Warning: image file 2: camera was zoomed in too much.

Black
Screen photo
Luminance 0.04 cd/m2
Luminance spread 0.02 cd/m2 (2 standard deviations)
Exposure value –7.15 stops   (aim for –2 to –3)
Exposure spread 0.79 stops
Area used for calculation 1 x 1
Camera settings Exposure time: 1   ISO: 400   F-number: 5
Focal length: 75 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 81 cd/m2
Luminance spread 15 cd/m2 (2 standard deviations)
Exposure value –1.98 stops   (aim for –2 to –3)
Exposure spread 0.26 stops
Area used for calculation 1 x 1
Camera settings Exposure time: 1/60   ISO: 400   F-number: 5
Focal length: 75 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.