Contrast ratio results

Black
Contrast ratio	868:1
Monitor model
Submitted	26 Sep 2014 21:26 CEST, by 91.157..
Camera model	Canon EOS 30D
Processing remarks	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: exposure time below 1/500 sec is unreliable. Try increasing the EV compensation. Warning: image file 2: automatic white balance can cause inaccuracies.
Screen photo	[open image]
Luminance	0.63 cd/m2
Luminance spread	0.25 cd/m2 (2 standard deviations)
Exposure value	–2.11 stops (aim for –2 to –3)
Exposure spread	0.57 stops
Area used for calculation	0.369 x 0.416
Camera settings	Exposure time: 0.5 ISO: 1000 F-number: 4 Focal length: 26.6 mm (35 mm equivalent) Exposure compensation: 1
White
Screen photo	[open image]
Luminance	549 cd/m2
Luminance spread	162 cd/m2 (2 standard deviations)
Exposure value	–2 stops (aim for –2 to –3)
Exposure spread	0.43 stops
Area used for calculation	0.369 x 0.416
Camera settings	Exposure time: 1/1600 ISO: 1000 F-number: 4 Focal length: 26.6 mm (35 mm equivalent) Exposure compensation: 1

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.