Contrast ratio results

Black
Contrast ratio	1117:1
Monitor model
Submitted	13 Dec 2011 05:51 CET, by 68.103..
Camera model	Canon EOS 450D
Processing remarks	Warning: image file 1: camera was zoomed in too much. Warning: image file 1: Underexposed. Please increase the shutter time. Note: image file 1: suggested exposure time: 277.5 s (Set EV to +5.5) Warning: image file 2: camera was zoomed in too much. Warning: Image F-number settings are not the same.
Screen photo	[open image]
Luminance	0.05 cd/m2
Luminance spread	0.04 cd/m2 (2 standard deviations)
Exposure value	–8.03 stops (aim for –2 to –3)
Exposure spread	1.26 stops
Area used for calculation	1 x 1
Camera settings	Exposure time: 6 ISO: 100 F-number: 10 Focal length: 244 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	61 cd/m2
Luminance spread	48 cd/m2 (2 standard deviations)
Exposure value	–1.81 stops (aim for –2 to –3)
Exposure spread	1.2 stops
Area used for calculation	1 x 1
Camera settings	Exposure time: 2.5 ISO: 100 F-number: 25 Focal length: 244 mm (35 mm equivalent) Exposure compensation: 0

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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.