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

Contrast ratio results

Contrast ratio 354:1
Monitor model
Submitted 12 Apr 2009 16:24 CEST, by 24.12.*.*
Camera model Nikon COOLPIX L14
Processing remarks

Warning: image file 1: automatic white balance can cause inaccuracies.
Warning: image file 2: automatic white balance can cause inaccuracies.
Note: image file 2: suggested exposure time: 1/140 s (Set EV to -1.2)
Warning: image file 3: automatic white balance can cause inaccuracies.
image file 3: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen.
Warning: Image ISO settings are not the same.
Warning: image file 3 is too bright to be a dark photo. Maybe you mixed up the files?

Black
Screen photo
[open image]
Luminance 0.67 cd/m2
Luminance spread 0.24 cd/m2 (2 standard deviations)
Exposure value –1.52 stops   (aim for –2 to –3)
Exposure spread 0.52 stops
Area used for calculation 0.549 x 0.549
Camera settings Exposure time: 1   ISO: 427   F-number: 3.1
Focal length: 38 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 238 cd/m2
Luminance spread 34 cd/m2 (2 standard deviations)
Exposure value –1.27 stops   (aim for –2 to –3)
Exposure spread 0.21 stops
Area used for calculation 0.549 x 0.549
Camera settings Exposure time: 1/60   ISO: 86   F-number: 3.1
Focal length: 38 mm   (35 mm equivalent)
Exposure compensation: 0
Black at screen edge
Screen photo
[open image]
Luminance 60 cd/m2
Luminance spread 188 cd/m2 (2 standard deviations)
Exposure value –2.36 stops   (aim for –2 to –3)
Exposure spread 4.25 stops
Area used for calculation 0.549 x 0.549
Camera settings Exposure time: 1/60   ISO: 159   F-number: 3.1
Focal length: 38 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.