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

Contrast ratio results

Contrast ratio 183:1 (edge: 2.07501e+06:1)
Monitor model
Submitted 23 Dec 2008 09:34 CET, by 93.145.*.*
Camera model Sony DSC-P200
Processing remarks

Warning: image file 3: Underexposed. Please increase the shutter time.
Note: image file 3: suggested exposure time: 5662.3 s (Set EV to +12.5)

Black
Screen photo
[open image]
Luminance 0.59 cd/m2
Luminance spread 0.75 cd/m2 (2 standard deviations)
Exposure value –1.5 stops   (aim for –2 to –3)
Exposure spread 2.14 stops
Area used for calculation 0.552 x 0.552
Camera settings Exposure time: 1   ISO: 400   F-number: 2.8
Focal length: 38.2 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 109 cd/m2
Luminance spread 29 cd/m2 (2 standard deviations)
Exposure value –2.63 stops   (aim for –2 to –3)
Exposure spread 0.38 stops
Area used for calculation 0.552 x 0.552
Camera settings Exposure time: 1/400   ISO: 400   F-number: 2.8
Focal length: 38.2 mm   (35 mm equivalent)
Exposure compensation: 0
Black at screen edge
Screen photo
[open image]
Luminance 0 cd/m2
Luminance spread 0 cd/m2 (2 standard deviations)
Exposure value –14.97 stops   (aim for –2 to –3)
Exposure spread 2.46 stops
Area used for calculation 0.552 x 0.552
Camera settings Exposure time: 1   ISO: 400   F-number: 2.8
Focal length: 38.2 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.