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

Contrast ratio results

Contrast ratio 180:1
Monitor model
Submitted 09 Jun 2010 21:52 CEST, by 206.197.*.*
Camera model Canon PowerShot S90
Processing remarks

Note: image file 2: suggested exposure time: 1/440 s (Set EV to -1.1)

Black
Screen photo
[open image]
Luminance 0.72 cd/m2
Luminance spread 0.8 cd/m2 (2 standard deviations)
Exposure value –3.22 stops   (aim for –2 to –3)
Exposure spread 1.81 stops
Area used for calculation 0.396 x 0.396
Camera settings Exposure time: 1/4   ISO: 400   F-number: 2.8
Focal length: 27.4 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 129 cd/m2
Luminance spread 58 cd/m2 (2 standard deviations)
Exposure value –1.39 stops   (aim for –2 to –3)
Exposure spread 0.65 stops
Area used for calculation 0.396 x 0.396
Camera settings Exposure time: 1/202   ISO: 400   F-number: 2.8
Focal length: 27.4 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.