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

Contrast ratio results

Contrast ratio 3090:1
Monitor model
Submitted 25 Feb 2009 10:59 CET, by 202.164.*.*
Camera model Canon PowerShot A80
Processing remarks

image file 1: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.

Black
Screen photo
[open image]
Luminance 0.04 cd/m2
Luminance spread 0 cd/m2 (2 standard deviations)
Exposure value –2.97 stops   (aim for –2 to –3)
Exposure spread 0.14 stops
Area used for calculation 0.537 x 0.537
Camera settings Exposure time: 9.9   ISO: 200   F-number: 2.8
Focal length: 37.2 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 133 cd/m2
Luminance spread 10 cd/m2 (2 standard deviations)
Exposure value –2.35 stops   (aim for –2 to –3)
Exposure spread 0.11 stops
Area used for calculation 0.537 x 0.537
Camera settings Exposure time: 1/202   ISO: 200   F-number: 2.8
Focal length: 37.2 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.