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

Contrast ratio results

Contrast ratio 1137:1
Monitor model
Submitted 11 Aug 2009 17:34 CEST, by 122.107.*.*
Camera model Canon DIGITAL IXUS 80 IS
Processing remarks

Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 5.2 s (Set EV to +2.4)
Warning: Image ISO settings are not the same.

Black
Screen photo
[open image]
Luminance 0.11 cd/m2
Luminance spread 0.07 cd/m2 (2 standard deviations)
Exposure value –4.88 stops   (aim for –2 to –3)
Exposure spread 0.9 stops
Area used for calculation 0.53 x 0.53
Camera settings Exposure time: 1   ISO: 200   F-number: 2.8
Focal length: 36.7 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 129 cd/m2
Luminance spread 25 cd/m2 (2 standard deviations)
Exposure value –1.96 stops   (aim for –2 to –3)
Exposure spread 0.28 stops
Area used for calculation 0.53 x 0.53
Camera settings Exposure time: 1/60   ISO: 80   F-number: 2.8
Focal length: 36.7 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.