Contrast ratio results

Black
Contrast ratio	570:1
Monitor model
Submitted	29 Nov 2008 11:59 CET, by 213.114..
Camera model	Canon EOS 40D
Processing remarks	Warning: image file 1: camera was zoomed in too much. Warning: image file 1: automatic white balance can cause inaccuracies. Note: image file 1: suggested exposure time: 2.1 s (Set EV to +1.1) Warning: image file 2: camera was zoomed in 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.
Screen photo	[open image]
Luminance	0.28 cd/m2
Luminance spread	0.15 cd/m2 (2 standard deviations)
Exposure value	–3.6 stops (aim for –2 to –3)
Exposure spread	0.83 stops
Area used for calculation	1 x 1
Camera settings	Exposure time: 1 ISO: 800 F-number: 5.6 Focal length: 138 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	158 cd/m2
Luminance spread	94 cd/m2 (2 standard deviations)
Exposure value	–3.07 stops (aim for –2 to –3)
Exposure spread	0.88 stops
Area used for calculation	1 x 1
Camera settings	Exposure time: 1/395 ISO: 800 F-number: 5.6 Focal length: 138 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.