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RE: filmscanners: Infrared dust removal accuracy

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

ICE depends on differences between the visible and IR transmission to
differentiate defects from image.   Color  slides and negatives are almost
completely transparent in the IR while the defects block both visible and
IR.  The defects stand out and can easily be removed.  Kodachrome dyes block
some of the IR, making separation of image and defects harder.  With B&W
negatives, visible and IR look the same and there is nothing to distinguish
image from defects.


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