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[filmscanners] Re: Scanner Exposure Settings



May or may not be applicable to other scanners, but with Vuescan + Polaroid 
120, really
dense negs take noticeably longer to scan. With the Polacolor software they do 
not take
longer to scan, but all the highlight detail is gone (good trade, Polaroid!).

Alex Z wrote:

> You may also mention the there are analog apmlifiers that are aimed to
> boost the CCD analogue output signal and at this stage it is also
> possible to control the gain (read exposure), however, this stage is
> sensitive to any noise interferring the signal so that it would be
> amplified also.
>
> Alex
> --- "Paul D. DeRocco" <pderocco@ix.netcom.com> wrote:
> > > From: Bill Seramin
> > >
> > > What happens internal to the scanner when adjustments are made on
> > the
> > > scan software?  In my mind I can only equate how a camera exposes
> > film;
> > > adjust exposure time and aperture.  Now I am confident in assuming
> > that
> > > the scanner does not have a variable mechanical aperture, an
> > equivalent
> > > for shutter adjustment, and from what I can tell the lamp
> > brightness
> > > does not vary during scanning.  So what happens when endpoints and
> > > curves are adjusted in the scan software?  Maybe I have dense film
> > or a
> > > dense brain, but I am having trouble visualizing what is going on.
> >
> > The only "hardware" variable is exposure time, which is how many
> > milliseconds it spends on each scan line before moving on to the next
> > one. I
> > don't know about the Polaroid driver but in Nikon drivers this is
> > labelled
> > Analog Gain. Everything else is done by arithmetic on the resulting
> > numbers.
> >
> > --
> >
> > Ciao,               Paul D. DeRocco
> > Paul                mailto:pderocco@ix.netcom.com
> >
> >
> >
> 
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