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

Contrast ratio of Dell

Contrast ratio 643:1
Monitor model Dell
Submitted 24 Apr 2013 15:24 CEST, by 46.194.*.*
Camera model Canon EOS 450D
Processing remarks

Note: image file 1: suggested exposure time: 2.3 s (Set EV to -1.2)

Black
Screen photo
[open image]
Luminance 0.26 cd/m2
Luminance spread 0.08 cd/m2 (2 standard deviations)
Exposure value –1.33 stops   (aim for –2 to –3)
Exposure spread 0.44 stops
Area used for calculation 0.628 x 0.706
Camera settings Exposure time: 5.2   ISO: 400   F-number: 4
Focal length: 45.2 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 169 cd/m2
Luminance spread 44 cd/m2 (2 standard deviations)
Exposure value –2 stops   (aim for –2 to –3)
Exposure spread 0.38 stops
Area used for calculation 0.628 x 0.706
Camera settings Exposure time: 1/197   ISO: 400   F-number: 4
Focal length: 45.2 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.