Filmscanners mailing list archive (filmscanners@halftone.co.uk)
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RE: filmscanners: LED Illumination for Film Scanners
> > No, not for a scanner, for an enlarger! I don't know whether they are a
> > good or bad idea for a scanner, but I do know that for B&W, I
> would rather
> > be using a ND filter, or something with that wavelength.
>
> ???
>
> an ND filter doesn't filter by wavelength, it simply reduces intensity.
>
> Of all wavelengths to (ideally) the same degree.
>
> So whatever the spectrum of the source is, the ND filter leaves it reduced
> in amplitude but unchanged in frequency.
>
> red light stays red etc
Er, right. I understand how an ND filter works. I guess I didn't quite say
that right.
But to the actual point, I'd like to understand if you get a "better" B&W
scan by using an ND filter, vs using one or more of the RGB channels and
converting to B&W.
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