Contrast ratio results

Contrast ratio 684:1
Monitor model
Submitted 27 Mar 2009 09:19 CET, by 67.48.*.*
Camera model Sony DSC-P72
Processing remarks

Warning: image file 1: could not determine angle of view; assuming 38 mm lens (35 mm equivalent).
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: 4.7 s (Set EV to +2.2)
Warning: image file 2: could not determine angle of view; assuming 38 mm lens (35 mm equivalent).
Warning: image file 2: Overexposed. Please decrease the shutter time.
Note: image file 2: suggested exposure time: 1/150 s (Set EV to -2.3)

Black
Screen photo
Luminance 0.06 cd/m2
Luminance spread 0.06 cd/m2 (2 standard deviations)
Exposure value –4.73 stops   (aim for –2 to –3)
Exposure spread 1.59 stops
Area used for calculation 0.528 x 0.528
Camera settings Exposure time: 1   ISO: 400   F-number: 2.8
Focal length: 0 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 43 cd/m2
Luminance spread 3 cd/m2 (2 standard deviations)
Exposure value –0.22 stops   (aim for –2 to –3)
Exposure spread 0.11 stops
Area used for calculation 0.528 x 0.528
Camera settings Exposure time: 1/30   ISO: 400   F-number: 2.8
Focal length: 0 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.