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

Contrast ratio results

Contrast ratio 41264:1
Monitor model
Submitted 26 Jun 2010 05:13 CEST, by 24.255.*.*
Camera model SAMSUNG VLUU ST5000 ST5000 TL240
Processing remarks

Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 293.3 s (Set EV to +10.2)

Black
Screen photo
[open image]
Luminance 0 cd/m2
Luminance spread 0 cd/m2 (2 standard deviations)
Exposure value –10.7 stops   (aim for –2 to –3)
Exposure spread 0.79 stops
Area used for calculation 0.448 x 0.448
Camera settings Exposure time: 1   ISO: 800   F-number: 3.3
Focal length: 31 mm   (35 mm equivalent)
Exposure compensation: 2
White
Screen photo
[open image]
Luminance 29 cd/m2
Luminance spread 3 cd/m2 (2 standard deviations)
Exposure value –2.36 stops   (aim for –2 to –3)
Exposure spread 0.15 stops
Area used for calculation 0.448 x 0.448
Camera settings Exposure time: 1/128   ISO: 800   F-number: 3.3
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.