Contrast ratio results

Black
Contrast ratio	12:1
Monitor model
Submitted	17 Jul 2009 05:16 CEST, by 67.223..
Camera model	Kodak EASYSHARE C643 ZOOM DIGITAL CAMERA
Processing remarks	image file 1: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time. Note: image file 1: suggested exposure time: 0.8 s (Set EV to -1.3) image file 2: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen.
Screen photo	[open image]
Luminance	1.69 cd/m2
Luminance spread	0.14 cd/m2 (2 standard deviations)
Exposure value	–1.21 stops (aim for –2 to –3)
Exposure spread	0.12 stops
Area used for calculation	0.52 x 0.52
Camera settings	Exposure time: 2 ISO: 80 F-number: 2.7 Focal length: 36 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	20 cd/m2
Luminance spread	7 cd/m2 (2 standard deviations)
Exposure value	–1.99 stops (aim for –2 to –3)
Exposure spread	0.56 stops
Area used for calculation	0.52 x 0.52
Camera settings	Exposure time: 1/10 ISO: 80 F-number: 2.7 Focal length: 36 mm (35 mm equivalent) Exposure compensation: 0

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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.