RE: [APML] Film Scanability

["Dale Ireland" <direland@drdale.com>]

Jason
I was responding to Andreas, regarding the Minolta scanner which has low
dynamic range and not enough resolution to define grain. The 120 could
certainly be just resolving grain or grain clumps. Sorry for any confusion.
I can resolve grain clumps with my Polaroid 4000 while my previous Nikon
scanner lacked dynamic range and its LED light source produced noise that
looked like grain, more like excessive contrast of dust and imperfections in
the film base.

Dale

> -----Original Message-----
> From: owner-astro-photo@seds.org [mailto:owner-astro-photo@seds.org]On
> Behalf Of Jason Ware
> Sent: Saturday, February 23, 2002 4:21 PM
> To: astro-photo@seds.org
> Subject: Re: [APML] Film Scanability
>
>
>
> I disagree, I have scanned the same negative several times,
> even moving it slightly and rescanning. I have used four
> different scanning software packages. I each case the grain
> pattern is the same.
>
> You are correct, multiple scanning will reduce scanner
> noise, but I think the noise is very low on the Sprintscan
> 120. I see very little noise reduction on multiple scans.
> On the other hand, individual dye clumps are resolved and
> are repeatable from scan to scan.
>
> The same dye clumps are there in an super sized blow up
> using an enlager, however they are less objectionable.
> The print is, however, softer. I can approximate the
> grain of a print using a blur, however, the edge detail
> is lost. Neat Image does a very good job on finer grain
> film, however, on more coarse film artifacts seem to
> get created. Overall a conventional print just looks
> smoother. Am I missing something here?
>
> Dale Ireland wrote:
> >
> > Hi
> > It isn't grain, it is noise from the sensor chip on the scanner
> due to the
> > limited dynamic range (3.2) of the scanner. making two scans,
> one for the
> > light areas of the negative, and one for the dark, then layering them
> > together will help reduce the problem a little.
> > Dale
> >
> > > -----Original Message-----
> > > From: owner-astro-photo@seds.org [mailto:owner-astro-photo@seds.org]On
> > > Behalf Of Andreas Roerig
> >
> > > My observations are very similar to yours. When scanning
> negatives (e.g.
> > > Royal Gold 400) with my Minolta Scan Dual II I always get a
> lot of grain.
> > > This is worse when the negative is not exposed to the sky limit.
> > > The higher
> > > the density of the negative the better the results. Best results
> > > I get with
> > > slide film.
> > >
> > > Regards
> > >    Andreas


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