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

Contrast ratio results

Contrast ratio 251:1
Monitor model
Submitted 26 Dec 2009 17:49 CET, by 85.77.*.*
Camera model Canon PowerShot SX10 IS
Processing remarks

image file 1: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.
Note: image file 1: suggested exposure time: 1/270 s (Set EV to -1.1)
image file 2: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen.
Note: image file 2: suggested exposure time: 0.9 s (Set EV to +1.2)

Black
Screen photo
[open image]
Luminance 0.63 cd/m2
Luminance spread 1.55 cd/m2 (2 standard deviations)
Exposure value –3.73 stops   (aim for –2 to –3)
Exposure spread 4.25 stops
Area used for calculation 0.399 x 0.399
Camera settings Exposure time: 0.4   ISO: 200   F-number: 2.8
Focal length: 27.6 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 158 cd/m2
Luminance spread 30 cd/m2 (2 standard deviations)
Exposure value –1.41 stops   (aim for –2 to –3)
Exposure spread 0.27 stops
Area used for calculation 0.399 x 0.399
Camera settings Exposure time: 1/125   ISO: 200   F-number: 2.8
Focal length: 27.6 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.