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

Contrast ratio results

Contrast ratio 2:1
Monitor model
Submitted 09 Nov 2013 10:53 CET, by 178.91.*.*
Camera model Nikon D3100
Processing remarks

Warning: image file 1: automatic white balance can cause inaccuracies.
image file 1: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen.
Note: image file 1: suggested exposure time: 1/25 s (Set EV to -1.3)
Warning: image file 2: automatic white balance can cause inaccuracies.
image file 2: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen.
Note: image file 2: suggested exposure time: 1/52 s (Set EV to -1.4)
Warning: Image focal lengths/zoom levels are not the same.

Black
Screen photo
[open image]
Luminance 15 cd/m2
Luminance spread 20 cd/m2 (2 standard deviations)
Exposure value –1.19 stops   (aim for –2 to –3)
Exposure spread 2.4 stops
Area used for calculation 0.956 x 0.561
Camera settings Exposure time: 1/10   ISO: 800   F-number: 5.6
Focal length: 51 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 31 cd/m2
Luminance spread 34 cd/m2 (2 standard deviations)
Exposure value –1.11 stops   (aim for –2 to –3)
Exposure spread 1.78 stops
Area used for calculation 0.737 x 0.427
Camera settings Exposure time: 1/20   ISO: 800   F-number: 5.6
Focal length: 39 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.