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

Contrast ratio results

Contrast ratio 8972:1
Monitor model
Submitted 07 Apr 2014 19:46 CEST, by 87.97.*.*
Camera model Canon PowerShot SX220 HS
Processing remarks

Warning: image file 1: automatic white balance can cause inaccuracies.
Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 277.3 s (Set EV to +8.1)
Warning: image file 2: automatic white balance can cause inaccuracies.
Warning: image file 2: Underexposed. Please increase the shutter time.
Note: image file 2: suggested exposure time: 1/32 s (Set EV to +1.9)

Black
Screen photo
[open image]
Luminance 0 cd/m2
Luminance spread 0 cd/m2 (2 standard deviations)
Exposure value –10.62 stops   (aim for –2 to –3)
Exposure spread 3.54 stops
Area used for calculation 0.403 x 0.403
Camera settings Exposure time: 1   ISO: 400   F-number: 3.1
Focal length: 27.9 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 12 cd/m2
Luminance spread 4 cd/m2 (2 standard deviations)
Exposure value –4.45 stops   (aim for –2 to –3)
Exposure spread 0.5 stops
Area used for calculation 0.403 x 0.403
Camera settings Exposure time: 1/125   ISO: 400   F-number: 3.1
Focal length: 27.9 mm   (35 mm equivalent)
Exposure compensation: 0
{adcode}

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.