Moose,
Thanks for your explanation in details.
I scan all 135 B/W negative film with Vuescan + Nikon LS-40 film scanner
since the infrared clean is workable, no problem at all (Nikon Scan fail to
apply ICE feature for B/W negative films). Thus, I wonder why fail to work
for Canon 8800F. Actually I don't know what is different of ICE & infrared
clean but the result of infrared clean in Vuescan is pretty good. I seldom
scan films with Nikon software upon purchasing Vuescan since I will apply
IT8 ICC profile to scan slide films, lock film base color for negative
films, Nikon software fails to do these.
It's difficult to remove dusts after scanning as large as 120 medium format.
It makes me trouble without infared clean :-(
---
Michael
2008/11/8 Moose <olymoose@xxxxxxxxx>
> Michael Wong wrote:
> > The problem is solved upon I disable Infrared clean option. I wonder
> there was no any problem to scan B/W negative film by my Nikon LS-40 scanner
> with Infrared clean option enabled but get problem with my Canon 8800F.
> >
> > Dunno the reason but working now.
> >
> Michael, I've been away from the list for a few days. I was just
> catching up and about to ask that you try turning off IR cleaning.
>
> IR cleaning can not actually work with silver based B&W film for
> physical/optical reasons. IR cleaning depends on the fact that IR is
> stopped by dust particles and affected very little by the dyes in color
> (and chromogenic (C41 process) B&W film). So the IR scan pass can
> differentiate between image details dust, hairs, etc. on the film.
>
> However, the silver particles that form the B&W image are also opaque to
> IR light, so practically the whole image is a "dust spot". I suspect
> that VueScan hasn't crashed, but is engaged in a futile attempt to work
> with endless dust correction. Leave it a couple of days, and it may
> complete - leaving a useless image.
>
> You may ask why it allows you to choose IR cleaning with B&W. As IR
> cleaning does work with the C41 process B&W films, it does need to be
> available for them.
>
> I suppose it's also because VueScan is the full tool set for
> sophisticated users, and allows you to do even dumb things if you want.
> For example, the dyes in Kodachrome also block IR although not as
> strongly as silver based B&W. I found that IR cleaning can do a nice job
> of cleaning up the skies on some old Kodachrome slides while introducing
> artifacts in the darker parts. So I could combine to scans, one with and
> one without IR cleaning, to get clean skies.
>
> Your Nikon software probably just ignores the IR clean setting with B&W
> film. I also recall that there were versions of ICE, on Epsons, as I
> recall, that switched to a non-IR based dust cleaning for B&W. In the
> Photo-i tests, the results were awful, with poor cleaning and lots of
> loss of sharpness.
>
> Moose
>
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