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

Contrast ratio results for Samsung 40C655

Contrast ratio 5461:1
Monitor model Samsung 40C655
Submitted 11 Nov 2010 09:26 CET, by 84.250.*.*
Camera model CASIO COMPUTER CO.LTD EX-Z750
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: 33.0 s (Set EV to +5.0)
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 file 2: Underexposed. Please increase the shutter time.
Note: image file 2: suggested exposure time: 1/170 s (Set EV to +2.0)

Black
Screen photo
[open image]
Luminance 0.01 cd/m2
Luminance spread 0 cd/m2 (2 standard deviations)
Exposure value –7.54 stops   (aim for –2 to –3)
Exposure spread 0.81 stops
Area used for calculation 0.549 x 0.549
Camera settings Exposure time: 1   ISO: 400   F-number: 2.8
Focal length: 38 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 49 cd/m2
Luminance spread 13 cd/m2 (2 standard deviations)
Exposure value –4.45 stops   (aim for –2 to –3)
Exposure spread 0.4 stops
Area used for calculation 0.549 x 0.549
Camera settings Exposure time: 1/640   ISO: 400   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.