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

Contrast ratio results

Contrast ratio 293:1 (edge: 267:1)
Monitor model
Submitted 18 Aug 2012 18:52 CEST, by 123.203.*.*
Camera model Panasonic DMC-FX520
Processing remarks

image file 2: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.
Note: image file 2: suggested exposure time: 1/180 s (Set EV to +1.1)

Black
Screen photo
[open image]
Luminance 0.19 cd/m2
Luminance spread 0.15 cd/m2 (2 standard deviations)
Exposure value –3.16 stops   (aim for –2 to –3)
Exposure spread 1.26 stops
Area used for calculation 0.361 x 0.361
Camera settings Exposure time: 1   ISO: 400   F-number: 2.8
Focal length: 25 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 55 cd/m2
Luminance spread 21 cd/m2 (2 standard deviations)
Exposure value –3.61 stops   (aim for –2 to –3)
Exposure spread 0.57 stops
Area used for calculation 0.361 x 0.361
Camera settings Exposure time: 1/400   ISO: 400   F-number: 2.8
Focal length: 25 mm   (35 mm equivalent)
Exposure compensation: 0
Black at screen edge
Screen photo
[open image]
Luminance 0.21 cd/m2
Luminance spread 0.24 cd/m2 (2 standard deviations)
Exposure value –3.03 stops   (aim for –2 to –3)
Exposure spread 1.88 stops
Area used for calculation 0.361 x 0.361
Camera settings Exposure time: 1   ISO: 400   F-number: 2.8
Focal length: 25 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.