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

Contrast ratio results

Contrast ratio 2345:1
Monitor model
Submitted 03 Mar 2011 21:07 CET, by 178.125.*.*
Camera model Sony DSC-T70
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.
Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 7.2 s (Set EV to +2.5)
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.
Warning: Image F-number settings are not the same.

Black
Screen photo
[open image]
Luminance 0.03 cd/m2
Luminance spread 0.01 cd/m2 (2 standard deviations)
Exposure value –5.35 stops   (aim for –2 to –3)
Exposure spread 0.3 stops
Area used for calculation 0.528 x 0.222
Camera settings Exposure time: 1   ISO: 800   F-number: 3.5
Focal length: 0 mm   (35 mm equivalent)
Exposure compensation: -0.3
White
Screen photo
[open image]
Luminance 75 cd/m2
Luminance spread 7 cd/m2 (2 standard deviations)
Exposure value –2.48 stops   (aim for –2 to –3)
Exposure spread 0.14 stops
Area used for calculation 0.528 x 0.362
Camera settings Exposure time: 1/125   ISO: 800   F-number: 5.6
Focal length: 0 mm   (35 mm equivalent)
Exposure compensation: -0.3

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.