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

Contrast ratio results

Contrast ratio 902:1
Monitor model
Submitted 25 Jan 2018 21:26 CET, by 79.116.*.*
Camera model Canon EOS 550D
Processing remarks

Warning: image file 1: camera was zoomed in too much.
Warning: image file 2: camera was zoomed in too much.
Warning: Image F-number settings are not the same.

Black
Screen photo
[open image]
Luminance 0.39 cd/m2
Luminance spread 0.14 cd/m2 (2 standard deviations)
Exposure value –2.09 stops   (aim for –2 to –3)
Exposure spread 0.51 stops
Area used for calculation 1 x 1
Camera settings Exposure time: 1   ISO: 400   F-number: 2.8
Focal length: 78.6 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 354 cd/m2
Luminance spread 91 cd/m2 (2 standard deviations)
Exposure value –2.34 stops   (aim for –2 to –3)
Exposure spread 0.37 stops
Area used for calculation 1 x 1
Camera settings Exposure time: 1/395   ISO: 400   F-number: 4.6
Focal length: 78.6 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.