Contrast ratio results for philips 190s

Contrast ratio 479:1
Monitor model philips 190s
Submitted 10 Nov 2009 14:38 CET, by 82.171.*.*
Camera model Canon DIGITAL IXUS 500
Processing remarks

Warning: image file 1: automatic white balance can cause inaccuracies.
image file 1: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen.
Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 0.5 s (Set EV to +3.3)
Warning: image file 2: automatic white balance can cause inaccuracies.
image file 2: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen.
Warning: image file 3: automatic white balance can cause inaccuracies.
image file 3: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen.
Warning: image file 3 is too bright to be a dark photo. Maybe you mixed up the files?

Black
Screen photo
Luminance 0.59 cd/m2
Luminance spread 4.49 cd/m2 (2 standard deviations)
Exposure value –5.82 stops   (aim for –2 to –3)
Exposure spread 4.25 stops
Area used for calculation 0.503 x 0.503
Camera settings Exposure time: 1/20   ISO: 400   F-number: 2.8
Focal length: 34.8 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 284 cd/m2
Luminance spread 63 cd/m2 (2 standard deviations)
Exposure value –1.25 stops   (aim for –2 to –3)
Exposure spread 0.32 stops
Area used for calculation 0.503 x 0.503
Camera settings Exposure time: 1/403   ISO: 400   F-number: 2.8
Focal length: 34.8 mm   (35 mm equivalent)
Exposure compensation: 0
Black at screen edge
Screen photo
Luminance 115 cd/m2
Luminance spread 235 cd/m2 (2 standard deviations)
Exposure value –1.56 stops   (aim for –2 to –3)
Exposure spread 4.25 stops
Area used for calculation 0.503 x 0.503
Camera settings Exposure time: 1/202   ISO: 400   F-number: 2.8
Focal length: 34.8 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.