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

Contrast ratio results

Contrast ratio 69:1
Monitor model
Submitted 30 Apr 2008 17:07 CEST, by 82.250.*.*
Camera model Kodak CX7430 ZOOM DIGITAL CAMERA
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: 1/13 s (Set EV to +0.3)
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: 1/210 s (Set EV to +0.8)
Warning: Image F-number settings are not the same.

Black
Screen photo
[open image]
Luminance 3.67 cd/m2
Luminance spread 1.89 cd/m2 (2 standard deviations)
Exposure value –4.26 stops   (aim for –2 to –3)
Exposure spread 0.76 stops
Area used for calculation 0.491 x 0.491
Camera settings Exposure time: 1/45   ISO: 400   F-number: 2.7
Focal length: 34 mm   (35 mm equivalent)
Exposure compensation: -1.5
White
Screen photo
[open image]
Luminance 255 cd/m2
Luminance spread 54 cd/m2 (2 standard deviations)
Exposure value –4.8 stops   (aim for –2 to –3)
Exposure spread 0.3 stops
Area used for calculation 0.491 x 0.491
Camera settings Exposure time: 1/1024   ISO: 400   F-number: 5.7
Focal length: 34 mm   (35 mm equivalent)
Exposure compensation: -1.5

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.