Contrast ratio results

Contrast ratio 12331:1
Monitor model
Submitted 02 Oct 2016 06:43 CEST, by 108.78.*.*
Camera model Canon HV20
Processing remarks

Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 123.3 s (Set EV to +7.9)
image file 2: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen.
Warning: Image F-number settings are not the same.

Black
Screen photo
Luminance 0.01 cd/m2
Luminance spread 0.04 cd/m2 (2 standard deviations)
Exposure value –10.45 stops   (aim for –2 to –3)
Exposure spread 4.25 stops
Area used for calculation 0.563 x 0.563
Camera settings Exposure time: 0.5   ISO: 100   F-number: 2.8
Focal length: 39 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 118 cd/m2
Luminance spread 241 cd/m2 (2 standard deviations)
Exposure value –3.32 stops   (aim for –2 to –3)
Exposure spread 4.25 stops
Area used for calculation 0.563 x 0.563
Camera settings Exposure time: 1/60   ISO: 100   F-number: 4.8
Focal length: 39 mm   (35 mm equivalent)
Exposure compensation: -3

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.