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

Contrast ratio results

Contrast ratio 500:1
Monitor model
Submitted 08 Mar 2017 22:58 CET, by 92.216.*.*
Camera model Panasonic DMC-G81
Processing remarks

image file 1: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen.
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 0.27 cd/m2
Luminance spread 0.37 cd/m2 (2 standard deviations)
Exposure value –3.21 stops   (aim for –2 to –3)
Exposure spread 2.5 stops
Area used for calculation 0.659 x 0.902
Camera settings Exposure time: 1/4   ISO: 400   F-number: 1.7
Focal length: 50 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 133 cd/m2
Luminance spread 66 cd/m2 (2 standard deviations)
Exposure value –1.22 stops   (aim for –2 to –3)
Exposure spread 0.73 stops
Area used for calculation 0.658 x 0.908
Camera settings Exposure time: 1/500   ISO: 400   F-number: 1.7
Focal length: 50 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.