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

Contrast ratio results

Contrast ratio 3231:1 (edge: 3831:1)
Monitor model
Submitted 18 May 2011 13:20 CEST, by 91.154.*.*
Camera model Panasonic DMC-TZ3
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: 15.0 s (Set EV to +3.9)
Warning: image file 2: automatic white balance can cause inaccuracies.
Warning: image file 3: automatic white balance can cause inaccuracies.
Warning: image file 3: Underexposed. Please increase the shutter time.
Note: image file 3: suggested exposure time: 17.8 s (Set EV to +4.2)
Warning: Image ISO settings are not the same.

Black
Screen photo
[open image]
Luminance 0.05 cd/m2
Luminance spread 0.04 cd/m2 (2 standard deviations)
Exposure value –6.41 stops   (aim for –2 to –3)
Exposure spread 1.16 stops
Area used for calculation 0.404 x 0.404
Camera settings Exposure time: 1   ISO: 200   F-number: 3.3
Focal length: 28 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 177 cd/m2
Luminance spread 21 cd/m2 (2 standard deviations)
Exposure value –1.66 stops   (aim for –2 to –3)
Exposure spread 0.17 stops
Area used for calculation 0.404 x 0.404
Camera settings Exposure time: 1/60   ISO: 100   F-number: 3.3
Focal length: 28 mm   (35 mm equivalent)
Exposure compensation: 0
Black at screen edge
Screen photo
[open image]
Luminance 0.05 cd/m2
Luminance spread 0.04 cd/m2 (2 standard deviations)
Exposure value –6.65 stops   (aim for –2 to –3)
Exposure spread 1.17 stops
Area used for calculation 0.404 x 0.404
Camera settings Exposure time: 1   ISO: 200   F-number: 3.3
Focal length: 28 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.