Contrast ratio results

Black
Contrast ratio	221:1
Monitor model
Submitted	05 Sep 2012 04:12 CEST, by 217.118..
Camera model	Panasonic DMC-TZ7
Processing remarks	Warning: image file 1: could not determine angle of view; assuming 38 mm lens (35 mm equivalent). Warning: image file 2: could not determine angle of view; assuming 38 mm lens (35 mm equivalent).
Screen photo	[open image]
Luminance	0.55 cd/m2
Luminance spread	0.05 cd/m2 (2 standard deviations)
Exposure value	–2.22 stops (aim for –2 to –3)
Exposure spread	0.12 stops
Area used for calculation	0.528 x 0.528
Camera settings	Exposure time: 1 ISO: 800 F-number: 4.9 Focal length: 0 mm (35 mm equivalent) Exposure compensation: -0.33
White
Screen photo	[open image]
Luminance	122 cd/m2
Luminance spread	7 cd/m2 (2 standard deviations)
Exposure value	–2.08 stops (aim for –2 to –3)
Exposure spread	0.08 stops
Area used for calculation	0.528 x 0.528
Camera settings	Exposure time: 1/200 ISO: 800 F-number: 4.9 Focal length: 0 mm (35 mm equivalent) Exposure compensation: -0.33

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.