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

Contrast ratio results

Contrast ratio 231:1
Monitor model
Submitted 24 Jan 2010 20:33 CET, by 94.25.*.*
Camera model Samsung Techwin KENOX S760 / Samsung S7
Processing remarks

Note: image file 1: suggested exposure time: 3.3 s (Set EV to -1.3)
Note: image file 2: suggested exposure time: 1/70 s (Set EV to -1.6)

Black
Screen photo
[open image]
Luminance 0.36 cd/m2
Luminance spread 0.34 cd/m2 (2 standard deviations)
Exposure value –1.23 stops   (aim for –2 to –3)
Exposure spread 1.51 stops
Area used for calculation 0.549 x 0.549
Camera settings Exposure time: 8   ISO: 100   F-number: 2.8
Focal length: 38 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 83 cd/m2
Luminance spread 6 cd/m2 (2 standard deviations)
Exposure value –0.9 stops   (aim for –2 to –3)
Exposure spread 0.1 stops
Area used for calculation 0.549 x 0.549
Camera settings Exposure time: 1/23   ISO: 100   F-number: 2.8
Focal length: 38 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.