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

Contrast ratio results

Contrast ratio 431:1
Monitor model
Submitted 08 Apr 2014 22:03 CEST, by 83.20.*.*
Camera model Canon PowerShot A530
Processing remarks

Warning: image file 1: camera was zoomed in too much.
Note: image file 1: suggested exposure time: 5.6 s (Set EV to -1.4)
Warning: image file 2: camera was zoomed in too much.
Warning: Image ISO settings are not the same.

Black
Screen photo
[open image]
Luminance 0.2 cd/m2
Luminance spread 0.04 cd/m2 (2 standard deviations)
Exposure value –1.08 stops   (aim for –2 to –3)
Exposure spread 0.29 stops
Area used for calculation 1 x 1
Camera settings Exposure time: 15   ISO: 400   F-number: 5.5
Focal length: 138 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 88 cd/m2
Luminance spread 19 cd/m2 (2 standard deviations)
Exposure value –1.55 stops   (aim for –2 to –3)
Exposure spread 0.3 stops
Area used for calculation 1 x 1
Camera settings Exposure time: 1/8   ISO: 80   F-number: 5.5
Focal length: 138 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.