Digital BW, The Print

Bill,

You may be right but when I called Howtek they did not indicate that that is
the case. They publish a list of the optical resolutions for the drum
scanner. Basically, they use a combination of drum speed, step size, and
aperture size to obtain these rezolutions. Sol if what I understand they are
doing is the PMT scans at a specific dpi ie: 308dpi and the drum speed and
x-axis movements are adjusted for the physical size of the negative.

Why else would they publish such a list?

Mike


----- Original Message -----
From: "Bill Morse" <willym@...>
To: <DigitalBlackandWhiteThePrint@yahoogroups.com>; "Julian Thomas"
<julianthomas@...>
Sent: Friday, April 05, 2002 7:21 PM
Subject: [Digital BW] Scanning for print size: was Re: The 7... (Yadda,
Yadda)


> Mike, this has come up before, and I'm still unclear how you accomplish
both
> the below and scan at the native resolution of the scanner.  Basically, I
> think you are putting the DPI of the final print above the scan quality.
>
> If you are scanning a 4x5  to print at ~20x24 @300 DPI, you need a file
with
> pixel dimensions of ~6000x7200; therefor you need to scan the 4x5 @ ~1500
> DPI.  But you can't if you are scanning w/ native resolution only!  You
> either have to scan @ 1333 DPI or @ 2000 DPI if you want native
resolution.
> If you force the scanner to scan @ 1500 DPI, I believe it will actually
scan
> @2000 DPI and rez down from there. (I think this is actually the source of
> what you describe as scans with less apparent grain)
>
> The opposite, scanner-centric process, would be to scan at the next higher
> scanner setting than you think you'll need, i.e. 2000 DPI, yielding an
> 8000x10000 pixel file, and then print to 20x24 at ~400 DPI.  There are
many
> grain -reducing techniques that, combined with this approach, I believe
> result in  prints with higher definition without increased grain.
>
> (Are your 15 minutes up yet)  ;^)
>
> Bill Morse
> PhotoProspect
> Cambridge, MA 02139
>
>
>
> ----- Original Message -----
> From: "Michael Kravit" <michael.kravit@...>
> To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
> Sent: Saturday, April 06, 2002 12:46 AM
> Subject: Re: [Digital BW] The 7 Truths of Digital Printing!
>
>
> > Julian,
> >
> > I scan to a final size of 20"x24" or so. That way 99% of what I print
will
> > be smaller. If I must rez up, I do so with Genuine Fractals.
> >
> > Mike
> >
> >
> > ----- Original Message -----
> > From: "Julian Thomas" <julianthomas@...>
> > To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
> > Sent: Friday, April 05, 2002 2:20 PM
> > Subject: Re: [Digital BW] The 7 Truths of Digital Printing!
> >
> >
> > > Mike, try it - I swear by it. It makes even my haulage neg. printable!
> BTW
> > > you mention scanning at  final output dpi rather than the full optical
> > res.
> > > How do you resize, or do you scan multiple copies?
> > >
> > > Julian
> >
> >
> >
> >
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