Contrast ratio results

Black
Contrast ratio	829:1
Monitor model
Submitted	17 Jul 2011 14:40 CEST, by 82.182..
Camera model	Canon EOS 400D DIGITAL
Processing remarks	Warning: image file 1: camera was zoomed in too much. Warning: image file 2: camera was zoomed in too much. Warning: image file 2: exposure time below 1/500 sec is unreliable. Try increasing the EV compensation.
Screen photo	[open image]
Luminance	0.23 cd/m2
Luminance spread	0.04 cd/m2 (2 standard deviations)
Exposure value	–3.17 stops (aim for –2 to –3)
Exposure spread	0.26 stops
Area used for calculation	1 x 1
Camera settings	Exposure time: 0.5 ISO: 400 F-number: 2.2 Focal length: 78.1 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	190 cd/m2
Luminance spread	66 cd/m2 (2 standard deviations)
Exposure value	–2.77 stops (aim for –2 to –3)
Exposure spread	0.51 stops
Area used for calculation	1 x 1
Camera settings	Exposure time: 1/1250 ISO: 400 F-number: 2.2 Focal length: 78.1 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.