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

Contrast ratio results

Contrast ratio 635:1
Monitor model
Submitted 21 Jan 2013 07:42 CET, by 189.35.*.*
Camera model Nikon COOLPIX L120
Processing remarks

Warning: image file 1: automatic white balance can cause inaccuracies.
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: 5.3 s (Set EV to +2.4)
Warning: image file 2: automatic white balance can cause inaccuracies.
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: 1/83 s (Set EV to -1.5)
Warning: Image ISO settings are not the same.

Black
Screen photo
[open image]
Luminance 0.14 cd/m2
Luminance spread 0.06 cd/m2 (2 standard deviations)
Exposure value –4.92 stops   (aim for –2 to –3)
Exposure spread 0.65 stops
Area used for calculation 0.361 x 0.361
Camera settings Exposure time: 1   ISO: 200   F-number: 3.1
Focal length: 25 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 86 cd/m2
Luminance spread 5 cd/m2 (2 standard deviations)
Exposure value –1.03 stops   (aim for –2 to –3)
Exposure spread 0.09 stops
Area used for calculation 0.361 x 0.361
Camera settings Exposure time: 1/30   ISO: 140   F-number: 3.1
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.