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

Contrast ratio results

Contrast ratio 26:1
Monitor model
Submitted 02 Sep 2009 18:08 CEST, by 188.134.*.*
Camera model Kodak Z730 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: 0.9 s (Set EV to +5.9)
Warning: image file 2: camera was zoomed in too much.
Warning: image file 2: automatic white balance can cause inaccuracies.
image file 2: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen.
Warning: image file 2: Overexposed. Please decrease the shutter time.
Note: image file 2: suggested exposure time: 1/350 s (Set EV to -0.9)
Warning: Image ISO settings are not the same.
Warning: Image F-number settings are not the same.
Warning: Images were taken with different cameras.
Warning: Image focal lengths/zoom levels are not the same.

Black
Screen photo
[open image]
Luminance 82 cd/m2
Luminance spread 837 cd/m2 (2 standard deviations)
Exposure value –8.42 stops   (aim for –2 to –3)
Exposure spread 4.25 stops
Area used for calculation 0.916 x 1
Camera settings Exposure time: 1/64   ISO: 100   F-number: 22.6
Focal length: 67.2 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 2126 cd/m2
Luminance spread 1379 cd/m2 (2 standard deviations)
Exposure value –0.57 stops   (aim for –2 to –3)
Exposure spread 0.97 stops
Area used for calculation 1 x 1
Camera settings Exposure time: 1/91   ISO: 80   F-number: 5.7
Focal length: 89 mm   (35 mm equivalent)
Exposure compensation: 1

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.