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

Contrast ratio results

Contrast ratio 919:1
Monitor model
Submitted 20 Feb 2009 19:29 CET, by 83.91.*.*
Camera model Canon PowerShot A710 IS
Processing remarks

Note: image file 1: suggested exposure time: 15.2 s (Set EV to +1.3)
Warning: Image F-number settings are not the same.

Black
Screen photo
[open image]
Luminance 0.19 cd/m2
Luminance spread 0.08 cd/m2 (2 standard deviations)
Exposure value –3.84 stops   (aim for –2 to –3)
Exposure spread 0.61 stops
Area used for calculation 0.495 x 0.495
Camera settings Exposure time: 6   ISO: 82   F-number: 4
Focal length: 34.3 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 178 cd/m2
Luminance spread 14 cd/m2 (2 standard deviations)
Exposure value –1.84 stops   (aim for –2 to –3)
Exposure spread 0.11 stops
Area used for calculation 0.495 x 0.495
Camera settings Exposure time: 1/50   ISO: 82   F-number: 3.5
Focal length: 34.3 mm   (35 mm equivalent)
Exposure compensation: 0
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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.