On Fri, 17 Jun 2005, Gerhard Fuernkranz wrote:
Hal V Engel schrieb:
The Canon LIDe 20 (and some other scanners) use three light emitting
diodes (one each red, green and blue) that results in a light spectrum
that is very close to sun light.
Actually I don't believe that. LEDs are basically know to be narrow-band
light sources, so I'm wondering, whether the LIDEs actually capture the full
spectrum w/o holes. Anyway - only the result counts ...
This is indeed an interesting issue. At first glance it seemed like
nonsense to me, but after some more thought it seems that if the color
of the LEDs are indeed narrow-band light sources and their colors
happen to be located close to standard primary colors, then it should
be possible to capture a nice scan.
Using primary-color light sources may not solve metamerism though
since there is still the sensor and the properties of what is being
scanned to consider.
Bob
======================================
Bob Friesenhahn
[EMAIL PROTECTED], http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer, http://www.GraphicsMagick.org/
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