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

Contrast ratio results

Contrast ratio 6712:1
Monitor model
Submitted 04 Oct 2012 00:26 CEST, by 187.193.*.*
Camera model Nikon COOLPIX L120
Processing remarks

image file 1: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.
Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 7.8 s (Set EV to +8.3)
Warning: image file 2: exposure time below 1/500 sec is unreliable. Try increasing the EV compensation.
image file 2: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.
Warning: Image F-number settings are not the same.
Warning: Image focal lengths/zoom levels are not the same.

Black
Screen photo
[open image]
Luminance 0.05 cd/m2
Luminance spread 0.06 cd/m2 (2 standard deviations)
Exposure value –10.79 stops   (aim for –2 to –3)
Exposure spread 1.83 stops
Area used for calculation 0.372 x 0.493
Camera settings Exposure time: 1/40   ISO: 400   F-number: 3.2
Focal length: 28 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 333 cd/m2
Luminance spread 49 cd/m2 (2 standard deviations)
Exposure value –2.3 stops   (aim for –2 to –3)
Exposure spread 0.21 stops
Area used for calculation 0.361 x 0.361
Camera settings Exposure time: 1/800   ISO: 400   F-number: 3.1
Focal length: 25 mm   (35 mm equivalent)
Exposure compensation: -1

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.