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

Contrast ratio results

Contrast ratio 1892:1
Monitor model
Submitted 22 Jun 2008 23:36 CEST, by 87.194.*.*
Camera model Canon PowerShot G3
Processing remarks

Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 32.4 s (Set EV to +5.0)
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 0.15 cd/m2
Luminance spread 0.23 cd/m2 (2 standard deviations)
Exposure value –7.52 stops   (aim for –2 to –3)
Exposure spread 3.17 stops
Area used for calculation 0.494 x 0.494
Camera settings Exposure time: 1   ISO: 100   F-number: 5.6
Focal length: 34.2 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 277 cd/m2
Luminance spread 214 cd/m2 (2 standard deviations)
Exposure value –1.96 stops   (aim for –2 to –3)
Exposure spread 1.18 stops
Area used for calculation 0.494 x 0.494
Camera settings Exposure time: 1/40   ISO: 100   F-number: 5.6
Focal length: 34.2 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.