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Re: filmscanners: Vuescan + Infrared

This is very interesting information.  Does Canon's software work
consistently in dust removal, or do they have the same problem?  It does
make some sense that the IR channel be refocused, since we know that IR
light has a different focal point than does visible white light, and
this is often indicated by the little red line or dot on camera lenses
to show the offset from white light focus, for those using IR film.

I have heard reports of FARE (Canon's IR dust removal system being
either very good and causing no softening of the image, to "not as
effective" as dICE.  Perhaps this explains it in part, that being, some
scans work well, others are less effective in registering properly.


EdHamrick@aol.com wrote:

 > In a message dated 12/18/2001 11:44:29 PM EST, 
philip.elkin@virgin.net writes:
 >>Does Vuescan use the same technique with infrared passes on all scanners,
 > Yes.
 >> and therefore any difference between say an LS30 and FS4000 in the OEM
 >> software are avoided.
 > The problem with the FS4000 is that there are two passes to get the
 > RGB and Infrared data, and these passes use different focus positions.
 > VueScan has problems aligning the two passes, so the infrared
 > dust removal sometimes doesn't work well on this scanner.
 > Regards,
 > Ed Hamrick
 > .


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