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

Contrast ratio results for Seiko/Epson

Contrast ratio 90:1
Monitor model Seiko/Epson
Submitted 05 Jun 2011 20:38 CEST, by 109.173.*.*
Camera model Canon PowerShot A460
Processing remarks

Warning: image file 1: camera was zoomed in too much.
image file 1: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.
Warning: image file 2: camera was zoomed in too much.
Warning: image file 3: camera was zoomed in too much.
Warning: image file 3 is too bright to be a dark photo. Maybe you mixed up the files?

Black
Screen photo
[open image]
Luminance 1.03 cd/m2
Luminance spread 2.07 cd/m2 (2 standard deviations)
Exposure value –2.71 stops   (aim for –2 to –3)
Exposure spread 4.25 stops
Area used for calculation 1 x 1
Camera settings Exposure time: 1/4   ISO: 400   F-number: 2.8
Focal length: 152 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 92 cd/m2
Luminance spread 60 cd/m2 (2 standard deviations)
Exposure value –2.19 stops   (aim for –2 to –3)
Exposure spread 0.98 stops
Area used for calculation 1 x 1
Camera settings Exposure time: 1/251   ISO: 400   F-number: 2.8
Focal length: 152 mm   (35 mm equivalent)
Exposure compensation: 0
Black at screen edge
Screen photo
[open image]
Luminance 49 cd/m2
Luminance spread 90 cd/m2 (2 standard deviations)
Exposure value –2.11 stops   (aim for –2 to –3)
Exposure spread 4.25 stops
Area used for calculation 1 x 1
Camera settings Exposure time: 1/125   ISO: 400   F-number: 2.8
Focal length: 152 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.