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

Contrast ratio results

Contrast ratio 1541:1
Monitor model
Submitted 20 Oct 2009 01:37 CEST, by 86.157.*.*
Camera model Canon EOS 400D DIGITAL
Processing remarks

Note: image file 1: suggested exposure time: 6.5 s (Set EV to +1.0)
image file 3: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.
Warning: image file 3 is too bright to be a dark photo. Maybe you mixed up the files?

Black
Screen photo
[open image]
Luminance 0.18 cd/m2
Luminance spread 0.05 cd/m2 (2 standard deviations)
Exposure value –3.52 stops   (aim for –2 to –3)
Exposure spread 0.4 stops
Area used for calculation 0.369 x 0.416
Camera settings Exposure time: 3.2   ISO: 400   F-number: 5.6
Focal length: 26.6 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 282 cd/m2
Luminance spread 32 cd/m2 (2 standard deviations)
Exposure value –2.25 stops   (aim for –2 to –3)
Exposure spread 0.17 stops
Area used for calculation 0.369 x 0.416
Camera settings Exposure time: 1/200   ISO: 400   F-number: 5.6
Focal length: 26.6 mm   (35 mm equivalent)
Exposure compensation: 0
Black at screen edge
Screen photo
[open image]
Luminance 154 cd/m2
Luminance spread 289 cd/m2 (2 standard deviations)
Exposure value –2.12 stops   (aim for –2 to –3)
Exposure spread 4.25 stops
Area used for calculation 0.369 x 0.416
Camera settings Exposure time: 1/100   ISO: 400   F-number: 5.6
Focal length: 26.6 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.