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

Contrast ratio results

Contrast ratio 114:1
Monitor model
Submitted 10 Apr 2013 07:53 CEST, by 195.113.*.*
Camera model Olympus SP-620UZ
Processing remarks

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 1.12 cd/m2
Luminance spread 1.55 cd/m2 (2 standard deviations)
Exposure value –2.38 stops   (aim for –2 to –3)
Exposure spread 2.48 stops
Area used for calculation 0.491 x 0.491
Camera settings Exposure time: 0.4   ISO: 400   F-number: 3.3
Focal length: 34 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 127 cd/m2
Luminance spread 64 cd/m2 (2 standard deviations)
Exposure value –1.55 stops   (aim for –2 to –3)
Exposure spread 0.74 stops
Area used for calculation 0.491 x 0.491
Camera settings Exposure time: 1/160   ISO: 400   F-number: 3.3
Focal length: 34 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.