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

Contrast ratio results

Contrast ratio 1:1
Monitor model
Submitted 29 Dec 2012 16:44 CET, by 86.101.*.*
Camera model Olympus SP510UZ
Processing remarks

Warning: image file 1: exposure time below 1/500 sec is unreliable. Try increasing the EV compensation.
image file 1: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen.
Warning: image file 1: Overexposed. Please decrease the shutter time.
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 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 629 cd/m2
Luminance spread 1256 cd/m2 (2 standard deviations)
Exposure value –2.96 stops   (aim for –2 to –3)
Exposure spread 4.25 stops
Area used for calculation 1 x 1
Camera settings Exposure time: 1/239   ISO: 100   F-number: 4.9
Focal length: 122 mm   (35 mm equivalent)
Exposure compensation: -1
White
Screen photo
[open image]
Luminance 643 cd/m2
Luminance spread 1502 cd/m2 (2 standard deviations)
Exposure value –2.77 stops   (aim for –2 to –3)
Exposure spread 4.25 stops
Area used for calculation 0.914 x 1
Camera settings Exposure time: 1/1000   ISO: 200   F-number: 3.2
Focal length: 65.8 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.