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

Contrast ratio results

Contrast ratio 450:1
Monitor model
Submitted 26 Jun 2010 05:40 CEST, by 24.255.*.*
Camera model SAMSUNG VLUU ST5000 ST5000 TL240
Processing remarks

Note: image file 1: suggested exposure time: 0.6 s (Set EV to +0.2)
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.

Black
Screen photo
[open image]
Luminance 0.35 cd/m2
Luminance spread 0.31 cd/m2 (2 standard deviations)
Exposure value –3.73 stops   (aim for –2 to –3)
Exposure spread 1.38 stops
Area used for calculation 0.448 x 0.448
Camera settings Exposure time: 1/4   ISO: 800   F-number: 3.3
Focal length: 31 mm   (35 mm equivalent)
Exposure compensation: -1
White
Screen photo
[open image]
Luminance 158 cd/m2
Luminance spread 60 cd/m2 (2 standard deviations)
Exposure value –3.38 stops   (aim for –2 to –3)
Exposure spread 0.55 stops
Area used for calculation 0.448 x 0.448
Camera settings Exposure time: 1/167   ISO: 800   F-number: 9.6
Focal length: 31 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.