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Contrast ratio results for HP LP2475w

Contrast ratio 526184:1
Monitor model HP LP2475w
Submitted 22 Dec 2008 15:44 CET, by 84.146.*.*
Camera model Canon PowerShot S80
Processing remarks

Warning: image file 1: camera was zoomed in too much.
Warning: image file 1: automatic white balance can cause inaccuracies.
Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 23732.6 s (Set EV to +15.5)
Warning: image file 2: camera was zoomed in too much.
Warning: image file 2: automatic white balance can cause inaccuracies.
Warning: image file 2: Overexposed. Please decrease the shutter time.
Note: image file 2: suggested exposure time: 1/9 s (Set EV to -2.3)
Warning: Image F-number settings are not the same.

Black
Screen photo
[open image]
Luminance 0 cd/m2
Luminance spread 0 cd/m2 (2 standard deviations)
Exposure value –18.03 stops   (aim for –2 to –3)
Exposure spread 4.25 stops
Area used for calculation 1 x 1
Camera settings Exposure time: 0.5   ISO: 50   F-number: 5.3
Focal length: 96.2 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 188 cd/m2
Luminance spread 14 cd/m2 (2 standard deviations)
Exposure value –0.22 stops   (aim for –2 to –3)
Exposure spread 0.11 stops
Area used for calculation 1 x 1
Camera settings Exposure time: 0.5   ISO: 50   F-number: 8
Focal length: 96.2 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.