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Re: filmscanners: Re: filmscanners: Infrared dust removal accuracy



Rob's right, of course; since IR won't pass through silver halides, it won't 
have much reference for repairing a BW neg. OTOH, it seems like it would 
create a perfect "mask" if the neg were scratched, because the IR *would* 
pass through the scratches. It could then be offset slightly to pick up the 
values to one side of the scratches, or from a blurred copy of the picture.

I don't know if anybody's tried this, but it seems doable, at least as a 
theory. If IR reacts the same way to a fine line of detail as it would to a 
scratch, however, it would probably be more trouble than it's worth. :-)

Best regards--LRA


> >Roger wrote:
> >>Silver based black and white film won't pass IR, so there's no way to
>use IR dust removal with it.

> >Lynn wrote:
> > Granted that it's not going to be effective for *dust removal*,
> > wouldn't IR still be extremely usefull for a badly-scratched
> > silver-halide neg?

>Rob wrote: How does the software determine what is a scratch and what 
>isn't?
>The whole point with a chromogenic image is that the image doesn't
>appear in the IR channel.  You don't have that with a B&W neg.
>I don't think there would be any advantage to an IR channel
>compared to a "normal" channel in terms of scratches except
>that the scratch *may* be a little more obvious.  The main
>problem is that the scratch might also be a fine line of
>image detail...
>

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