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

Contrast ratio results

Contrast ratio 853:1
Monitor model
Submitted 08 Dec 2013 22:55 CET, by 94.214.*.*
Camera model Canon PowerShot G12
Processing remarks

image file 1: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.
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 0.28 cd/m2
Luminance spread 0.17 cd/m2 (2 standard deviations)
Exposure value –3.32 stops   (aim for –2 to –3)
Exposure spread 0.88 stops
Area used for calculation 0.411 x 0.548
Camera settings Exposure time: 0.6   ISO: 400   F-number: 2.8
Focal length: 31 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 239 cd/m2
Luminance spread 100 cd/m2 (2 standard deviations)
Exposure value –1.16 stops   (aim for –2 to –3)
Exposure spread 0.61 stops
Area used for calculation 0.411 x 0.548
Camera settings Exposure time: 1/318   ISO: 400   F-number: 2.8
Focal length: 31 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.