Contrast ratio results

Contrast ratio 1:1
Monitor model
Submitted 31 Jul 2011 14:29 CEST, by 88.146.*.*
Camera model Canon EOS 450D
Processing remarks

Warning: image file 1: camera was zoomed out too much.
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 2: camera was zoomed out too much.
Warning: image file 2: automatic white balance can cause inaccuracies.
image file 2: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.
Warning: image file 3: camera was zoomed out too much.
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 is too bright to be a dark photo. Maybe you mixed up the files?

Black
Screen photo
Luminance 195 cd/m2
Luminance spread 0 cd/m2 (2 standard deviations)
Exposure value –2.19 stops   (aim for –2 to –3)
Exposure spread 0 stops
Area used for calculation 0.1 x 0.123
Camera settings Exposure time: 1/64   ISO: 200   F-number: 5.7
Focal length: 7.1 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 195 cd/m2
Luminance spread 0 cd/m2 (2 standard deviations)
Exposure value –2.19 stops   (aim for –2 to –3)
Exposure spread 0 stops
Area used for calculation 0.1 x 0.123
Camera settings Exposure time: 1/64   ISO: 200   F-number: 5.7
Focal length: 7.1 mm   (35 mm equivalent)
Exposure compensation: 0
Black at screen edge
Screen photo
Luminance 195 cd/m2
Luminance spread 0 cd/m2 (2 standard deviations)
Exposure value –2.19 stops   (aim for –2 to –3)
Exposure spread 0 stops
Area used for calculation 0.1 x 0.123
Camera settings Exposure time: 1/64   ISO: 200   F-number: 5.7
Focal length: 7.1 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.