Contrast ratio results for LG LCD TV 42"

Contrast ratio 484:1
Monitor model LG LCD TV 42"
Submitted 10 Jan 2009 19:48 CET, by 84.217.*.*
Camera model Canon EOS DIGITAL REBEL XTi
Processing remarks

Warning: Image F-number settings are not the same.

Black
Screen photo
Luminance 0.59 cd/m2
Luminance spread 0.42 cd/m2 (2 standard deviations)
Exposure value –3.14 stops   (aim for –2 to –3)
Exposure spread 1.08 stops
Area used for calculation 0.455 x 0.513
Camera settings Exposure time: 1/4   ISO: 800   F-number: 3.5
Focal length: 32.8 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 288 cd/m2
Luminance spread 121 cd/m2 (2 standard deviations)
Exposure value –2.54 stops   (aim for –2 to –3)
Exposure spread 0.62 stops
Area used for calculation 0.76 x 0.858
Camera settings Exposure time: 1/500   ISO: 800   F-number: 5.6
Focal length: 54.8 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.