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

Contrast ratio results

Contrast ratio 876:1
Monitor model
Submitted 14 Jul 2011 20:26 CEST, by 67.164.*.*
Camera model Canon EOS DIGITAL REBEL XSi
Processing remarks

Warning: image file 1: camera was zoomed out too much.
Note: image file 1: suggested exposure time: 13.2 s (Set EV to +0.3)
Warning: image file 2: camera was zoomed out too much.

Black
Screen photo
[open image]
Luminance 0.09 cd/m2
Luminance spread 0 cd/m2 (2 standard deviations)
Exposure value –3.84 stops   (aim for –2 to –3)
Exposure spread 0.05 stops
Area used for calculation 0.1 x 0.113
Camera settings Exposure time: 5.2   ISO: 400   F-number: 5.7
Focal length: 7.1 mm   (35 mm equivalent)
Exposure compensation: -1
White
Screen photo
[open image]
Luminance 82 cd/m2
Luminance spread 2 cd/m2 (2 standard deviations)
Exposure value –3.07 stops   (aim for –2 to –3)
Exposure spread 0.04 stops
Area used for calculation 0.1 x 0.113
Camera settings Exposure time: 1/99   ISO: 400   F-number: 5.7
Focal length: 7.1 mm   (35 mm equivalent)
Exposure compensation: -1

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.