Contrast ratio | Test results | LCD test | Small-screen tests | Lagom home

Contrast ratio results

Contrast ratio 1370:1
Monitor model
Submitted 31 Jan 2014 23:46 CET, by 77.78.*.*
Camera model Canon PowerShot SX160 IS
Processing remarks

Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 7.4 s (Set EV to +2.9)
image file 2: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen.

Black
Screen photo
[open image]
Luminance 0.06 cd/m2
Luminance spread 0.04 cd/m2 (2 standard deviations)
Exposure value –5.39 stops   (aim for –2 to –3)
Exposure spread 0.83 stops
Area used for calculation 0.406 x 0.406
Camera settings Exposure time: 1   ISO: 400   F-number: 3.5
Focal length: 28.1 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 85 cd/m2
Luminance spread 58 cd/m2 (2 standard deviations)
Exposure value –2.94 stops   (aim for –2 to –3)
Exposure spread 1.02 stops
Area used for calculation 0.406 x 0.406
Camera settings Exposure time: 1/251   ISO: 400   F-number: 3.5
Focal length: 28.1 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.