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

Contrast ratio results

Contrast ratio 12:1
Monitor model
Submitted 17 Jul 2009 05:16 CEST, by 67.223.*.*
Camera model Kodak EASYSHARE C643 ZOOM DIGITAL CAMERA
Processing remarks

image file 1: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.
Note: image file 1: suggested exposure time: 0.8 s (Set EV to -1.3)
image file 2: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen.

Black
Screen photo
[open image]
Luminance 1.69 cd/m2
Luminance spread 0.14 cd/m2 (2 standard deviations)
Exposure value –1.21 stops   (aim for –2 to –3)
Exposure spread 0.12 stops
Area used for calculation 0.52 x 0.52
Camera settings Exposure time: 2   ISO: 80   F-number: 2.7
Focal length: 36 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 20 cd/m2
Luminance spread 7 cd/m2 (2 standard deviations)
Exposure value –1.99 stops   (aim for –2 to –3)
Exposure spread 0.56 stops
Area used for calculation 0.52 x 0.52
Camera settings Exposure time: 1/10   ISO: 80   F-number: 2.7
Focal length: 36 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.