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

Contrast ratio results

Contrast ratio 1:1
Monitor model
Submitted 11 Mar 2010 10:22 CET, by 114.24.*.*
Camera model Nikon D700
Processing remarks

Warning: image file 1: automatic white balance can cause inaccuracies.
image file 1: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen.
Warning: using the flash makes no sense.
Warning: image file 2: camera was zoomed in too much.
Warning: image file 2: exposure time below 1/500 sec is unreliable. Try increasing the EV compensation.
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 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 295 cd/m2
Luminance spread 454 cd/m2 (2 standard deviations)
Exposure value –2.21 stops   (aim for –2 to –3)
Exposure spread 2.93 stops
Area used for calculation 1 x 0.562
Camera settings Exposure time: 1/800   ISO: 200   F-number: 2
Focal length: 100 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 403 cd/m2
Luminance spread 1245 cd/m2 (2 standard deviations)
Exposure value –2.72 stops   (aim for –2 to –3)
Exposure spread 4.25 stops
Area used for calculation 0.5 x 0.25
Camera settings Exposure time: 1/500   ISO: 640   F-number: 6.3
Focal length: 24 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.