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

Contrast ratio results

Contrast ratio 891:1
Monitor model
Submitted 23 Feb 2011 01:28 CET, by 75.129.*.*
Camera model Canon PowerShot SX200 IS
Processing remarks

Note: image file 1: suggested exposure time: 2.2 s (Set EV to +1.2)

Black
Screen photo
[open image]
Luminance 0.2 cd/m2
Luminance spread 0.03 cd/m2 (2 standard deviations)
Exposure value –3.66 stops   (aim for –2 to –3)
Exposure spread 0.23 stops
Area used for calculation 0.394 x 0.394
Camera settings Exposure time: 1   ISO: 400   F-number: 3.4
Focal length: 27.3 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 174 cd/m2
Luminance spread 19 cd/m2 (2 standard deviations)
Exposure value –1.52 stops   (aim for –2 to –3)
Exposure spread 0.16 stops
Area used for calculation 0.394 x 0.394
Camera settings Exposure time: 1/202   ISO: 400   F-number: 3.4
Focal length: 27.3 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.