Contrast ratio results

Contrast ratio 114:1
Monitor model
Submitted 17 Jul 2009 05:23 CEST, by 67.223.*.*
Camera model Kodak EASYSHARE C643 ZOOM DIGITAL CAMERA
Processing remarks

Warning: using the flash makes no sense.
image file 2: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen.

Black
Screen photo
Luminance 1.58 cd/m2
Luminance spread 0.21 cd/m2 (2 standard deviations)
Exposure value –2.3 stops   (aim for –2 to –3)
Exposure spread 0.19 stops
Area used for calculation 0.52 x 0.52
Camera settings Exposure time: 1   ISO: 80   F-number: 2.7
Focal length: 36 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 180 cd/m2
Luminance spread 60 cd/m2 (2 standard deviations)
Exposure value –1.47 stops   (aim for –2 to –3)
Exposure spread 0.49 stops
Area used for calculation 0.52 x 0.52
Camera settings Exposure time: 1/64   ISO: 80   F-number: 2.7
Focal length: 36 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.