Contrast ratio results

Black
Contrast ratio	24228:1
Monitor model
Submitted	01 Mar 2010 12:57 CET, by 89.246..
Camera model	Sony K800i
Processing remarks	Warning: image file 1: could not determine angle of view; assuming 38 mm lens (35 mm equivalent). Warning: image file 1: automatic white balance can cause inaccuracies. Warning: image file 1: Underexposed. Please increase the shutter time. Note: image file 1: suggested exposure time: 28.2 s (Set EV to +7.8) Warning: image file 2: could not determine angle of view; assuming 38 mm lens (35 mm equivalent). Warning: image file 2: automatic white balance can cause inaccuracies. Warning: Image ISO settings are not the same.
Screen photo	[open image]
Luminance	0.01 cd/m2
Luminance spread	0.02 cd/m2 (2 standard deviations)
Exposure value	–10.32 stops (aim for –2 to –3)
Exposure spread	4.25 stops
Area used for calculation	0.528 x 0.402
Camera settings	Exposure time: 1/8 ISO: 640 F-number: 2.8 Focal length: 0 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	159 cd/m2
Luminance spread	11 cd/m2 (2 standard deviations)
Exposure value	–1.66 stops (aim for –2 to –3)
Exposure spread	0.1 stops
Area used for calculation	0.528 x 0.435
Camera settings	Exposure time: 1/60 ISO: 80 F-number: 2.8 Focal length: 0 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.