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

Contrast ratio results

Contrast ratio 1639:1
Monitor model
Submitted 11 Dec 2010 09:17 CET, by 69.253.*.*
Camera model Canon PowerShot SD800 IS
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: 4.7 s (Set EV to +2.2)
image file 2: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.
Warning: Image ISO settings are not the same.

Black
Screen photo
[open image]
Luminance 0.12 cd/m2
Luminance spread 0.04 cd/m2 (2 standard deviations)
Exposure value –4.74 stops   (aim for –2 to –3)
Exposure spread 0.45 stops
Area used for calculation 0.393 x 0.393
Camera settings Exposure time: 1   ISO: 210   F-number: 2.8
Focal length: 27.2 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 195 cd/m2
Luminance spread 22 cd/m2 (2 standard deviations)
Exposure value –2.08 stops   (aim for –2 to –3)
Exposure spread 0.16 stops
Area used for calculation 0.393 x 0.393
Camera settings Exposure time: 1/101   ISO: 82   F-number: 2.8
Focal length: 27.2 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.