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

Contrast ratio results

Contrast ratio 273:1
Monitor model
Submitted 27 Feb 2008 18:20 CET, by 82.215.*.*
Camera model Canon PowerShot S3 IS
Processing remarks

Note: image file 2: suggested exposure time: 1/82 s (Set EV to -1.0)

Black
Screen photo
[open image]
Luminance 0.41 cd/m2
Luminance spread 0.1 cd/m2 (2 standard deviations)
Exposure value –1.65 stops   (aim for –2 to –3)
Exposure spread 0.36 stops
Area used for calculation 0.51 x 0.51
Camera settings Exposure time: 6   ISO: 80   F-number: 2.7
Focal length: 35.5 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 113 cd/m2
Luminance spread 17 cd/m2 (2 standard deviations)
Exposure value –1.46 stops   (aim for –2 to –3)
Exposure spread 0.22 stops
Area used for calculation 0.51 x 0.51
Camera settings Exposure time: 1/40   ISO: 80   F-number: 2.7
Focal length: 35.5 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.