RE: filmscanners: Scanner resolution (was: BWP seeks scanner)

[TonySleep@halftone.co.uk (Tony Sleep)]

On Mon, 18 Jun 2001 18:00:42 -0400  Austin Franklin 
(darkroom@ix.netcom.com) wrote:

> Huh?  How do they get even illumination, muchless correct wavelength 
> light,
> from LEDs as the light source? 

All Nikon scanners use coloured (R,G and B) LED's strobed sequentially, 
and capture the monochrome CCD's response to each in turn. Other scanners 
either use a continuous white lightsource and the filters are part of each 
CCD element, or a filter wheel is placed in front of the lightsource and 3 
passes made - this latter type uses a monochrome CCD too.

Regards 

Tony Sleep
http://www.halftone.co.uk - Online portfolio & exhibit; + film scanner 
info & comparisons