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[filmscanners] RE: Avoiding Newton rings



>I suppose you could also use ICE if it were available
> to you.
Yes; but only if you are using chromogenic black and white or color films.
However, I am not sure if ICE will help Newtonian Rings; it might help
remove the effects of the powder.

As for mucking up the insides if the scanner, I suppose that may be a risk;
however since it would be sandwiched between the glass and the film, which
would also be sandwiched between the two sheets of glass, I doubt if its
travelimg from the film holder to the innards of the scanner may be slight
unless there is a fan involved.

> -----Original Message-----
> From: filmscanners_owner@halftone.co.uk
> [mailto:filmscanners_owner@halftone.co.uk]On Behalf Of Brian
> Sent: Saturday, September 28, 2002 11:35 AM
> To: laurie@advancenet.net
> Subject: [filmscanners] Re: Avoiding Newton rings
>
>
> I see. Any
> possibility the powder would muck up the insides of the scanner?
>
> Brian
> --------------------------------------------------------------
> respond to bdplikaytis@bellsouth.net
>
>
> ----- Original Message -----
> From: "Laurie Solomon" <laurie@advancenet.net>
> To: <bdplikaytis@bellsouth.net>
> Sent: Friday, September 27, 2002 11:31 PM
> Subject: [filmscanners] RE: Avoiding Newton rings
>
>
> Yes and no.  The powder is a very very fine powder and the
> amont used is
> very sparing.  Even so, depending on the degree of
> enlargement, it typically
> under traditional methods of enlargement acts in the same way
> and has a
> similar appearance to that of grain or a dye cloud; in terms
> of scanning, I
> would assume that the same would hold since the particles are
> very miniscule
> and dispersed if used correctly.  Furthermore the glass
> offers some inherent
> diffusion that will take the edge off any particles that do
> show up usually
> resulting in a scan not unlike a non-condenser enlarger enlargement.
>
> At worse, you would need to correct for the effects of the powder in
> Photoshop.  Nothing is for free; everything involves a
> trade-off.  At least
> digital spoting of particle traces be they dust or scratches
> is feasible in
> most cases whereas the alternative Newtonian Rings are not as
> ameanable to
> remedy digitally or otherwise once they exist.
>
> -----Original Message-----
> From: filmscanners_owner@halftone.co.uk
> [mailto:filmscanners_owner@halftone.co.uk]On Behalf Of Brian
> Sent: Saturday, September 28, 2002 7:07 AM
> To: laurie@advancenet.net
> Subject: [filmscanners] Re: Avoiding Newton rings
>
>
> >One way that this has been dealt with is by using a glass which has a
> >very fine etched surface which creates very small "contact points"
> >between the two surfaces.  Another method is to use a very
> fine powder
> >(talc is sometimes used) to again create this "airpace" with minimal
> >contact points.
>
> I have read about the fine powder technique before. But wouldn't this
> degrade the scanned image (kind of act like dust particles)?
>
> Brian P.
> --------------------------------------------------------------
> Remove 'nspm' from email address and
> respond to bdplikaytis@bellsouth.net
>
>
>
>
>
>
>
>
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