Contrast ratio results

Contrast ratio 1449:1
Monitor model
Submitted 06 Jul 2014 23:21 CEST, by 83.163.*.*
Camera model Canon PowerShot SX230 HS
Processing remarks

Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 1.8 s (Set EV to +1.8)

Black
Screen photo
Luminance 0.2 cd/m2
Luminance spread 0.03 cd/m2 (2 standard deviations)
Exposure value –4.33 stops   (aim for –2 to –3)
Exposure spread 0.22 stops
Area used for calculation 0.403 x 0.403
Camera settings Exposure time: 0.5   ISO: 400   F-number: 3.1
Focal length: 27.9 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 296 cd/m2
Luminance spread 60 cd/m2 (2 standard deviations)
Exposure value –1.48 stops   (aim for –2 to –3)
Exposure spread 0.29 stops
Area used for calculation 0.403 x 0.403
Camera settings Exposure time: 1/403   ISO: 400   F-number: 3.1
Focal length: 27.9 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.