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

Contrast ratio results

Contrast ratio 729:1
Monitor model
Submitted 14 Feb 2010 07:45 CET, by 69.226.*.*
Camera model Sony DSC-W180
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.
image file 1: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.
Note: image file 1: suggested exposure time: 0.6 s (Set EV to +1.4)
Warning: image file 2: could not determine angle of view; assuming 38 mm lens (35 mm equivalent).
Warning: image file 2: exposure time below 1/500 sec is unreliable. Try increasing the EV compensation.
Warning: image file 2: automatic white balance can cause inaccuracies.
image file 2: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.

Black
Screen photo
[open image]
Luminance 0.56 cd/m2
Luminance spread 0.83 cd/m2 (2 standard deviations)
Exposure value –3.87 stops   (aim for –2 to –3)
Exposure spread 2.74 stops
Area used for calculation 0.528 x 0.528
Camera settings Exposure time: 1/4   ISO: 400   F-number: 3.1
Focal length: 0 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 411 cd/m2
Luminance spread 117 cd/m2 (2 standard deviations)
Exposure value –1.68 stops   (aim for –2 to –3)
Exposure spread 0.41 stops
Area used for calculation 0.528 x 0.528
Camera settings Exposure time: 1/640   ISO: 400   F-number: 3.1
Focal length: 0 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.