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

Contrast ratio results

Contrast ratio 3324:1
Monitor model
Submitted 23 Aug 2009 17:00 CEST, by 78.101.*.*
Camera model Nokia N79
Processing remarks

Warning: image file 1: could not determine angle of view; assuming 38 mm lens (35 mm equivalent).
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: 6.4 s (Set EV to +6.8)
Warning: image file 2: could not determine angle of view; assuming 38 mm lens (35 mm equivalent).
image file 2: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen.
Warning: image file 2: Overexposed. Please decrease the shutter time.
Note: image file 2: suggested exposure time: 1/110 s (Set EV to -1.8)
Warning: Image ISO settings are not the same.

Black
Screen photo
[open image]
Luminance 0.02 cd/m2
Luminance spread 0.01 cd/m2 (2 standard deviations)
Exposure value –9.26 stops   (aim for –2 to –3)
Exposure spread 0.34 stops
Area used for calculation 0.528 x 0.528
Camera settings Exposure time: 1/17   ISO: 800   F-number: 2.8
Focal length: 0 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 78 cd/m2
Luminance spread 74 cd/m2 (2 standard deviations)
Exposure value –0.71 stops   (aim for –2 to –3)
Exposure spread 1.51 stops
Area used for calculation 0.528 x 0.528
Camera settings Exposure time: 1/33   ISO: 174   F-number: 2.8
Focal length: 0 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.