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

Contrast ratio results

Contrast ratio 14871:1
Monitor model
Submitted 13 Jun 2010 22:45 CEST, by 85.181.*.*
Camera model Sony DSC-W190
Processing remarks

Warning: image file 1: could not determine angle of view; assuming 38 mm lens (35 mm equivalent).
Warning: image file 1: automatic white balance can cause inaccuracies.
Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 28.2 s (Set EV to +7.8)
Warning: image file 2: could not determine angle of view; assuming 38 mm lens (35 mm equivalent).
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.
Warning: Image ISO settings are not the same.
Warning: Image F-number settings are not the same.

Black
Screen photo
[open image]
Luminance 0.01 cd/m2
Luminance spread 0.01 cd/m2 (2 standard deviations)
Exposure value –10.32 stops   (aim for –2 to –3)
Exposure spread 1.17 stops
Area used for calculation 0.528 x 0.528
Camera settings Exposure time: 1/8   ISO: 400   F-number: 3.1
Focal length: 0 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 192 cd/m2
Luminance spread 110 cd/m2 (2 standard deviations)
Exposure value –3.38 stops   (aim for –2 to –3)
Exposure spread 0.85 stops
Area used for calculation 0.528 x 0.528
Camera settings Exposure time: 1/80   ISO: 100   F-number: 5.4
Focal length: 0 mm   (35 mm equivalent)
Exposure compensation: -1.3

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.