Contrast ratio results

Black
Contrast ratio	348:1
Monitor model
Submitted	10 Aug 2009 13:51 CEST, by 67.161..
Camera model	Panasonic DMC-LZ2
Processing remarks	Warning: image file 1: camera was zoomed in too much. image file 1: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen. Warning: image file 2: camera was zoomed in too much. image file 2: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen. Warning: image file 2: Underexposed. Please increase the shutter time. Note: image file 2: suggested exposure time: 1/56 s (Set EV to +0.2) Warning: Image F-number settings are not the same.
Screen photo	[open image]
Luminance	0.5 cd/m2
Luminance spread	0.11 cd/m2 (2 standard deviations)
Exposure value	–3.13 stops (aim for –2 to –3)
Exposure spread	0.32 stops
Area used for calculation	1 x 1
Camera settings	Exposure time: 1 ISO: 400 F-number: 4.5 Focal length: 222 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	172 cd/m2
Luminance spread	67 cd/m2 (2 standard deviations)
Exposure value	–4.33 stops (aim for –2 to –3)
Exposure spread	0.56 stops
Area used for calculation	1 x 1
Camera settings	Exposure time: 1/200 ISO: 400 F-number: 9 Focal length: 222 mm (35 mm equivalent) Exposure compensation: -1.66

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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.