Contrast ratio results

Black
Contrast ratio	414:1
Monitor model
Submitted	15 Mar 2008 20:17 CET, by 212.50..
Camera model	Canon EOS D30
Processing remarks	image file 1: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen. image file 2: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.
Screen photo	[open image]
Luminance	0.32 cd/m2
Luminance spread	0.15 cd/m2 (2 standard deviations)
Exposure value	–3.02 stops (aim for –2 to –3)
Exposure spread	0.68 stops
Area used for calculation	0.387 x 0.436
Camera settings	Exposure time: 1 ISO: 400 F-number: 3.5 Focal length: 27.9 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	134 cd/m2
Luminance spread	44 cd/m2 (2 standard deviations)
Exposure value	–2.78 stops (aim for –2 to –3)
Exposure spread	0.48 stops
Area used for calculation	0.387 x 0.436
Camera settings	Exposure time: 1/350 ISO: 400 F-number: 3.5 Focal length: 27.9 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.