-------- Original Message --------
Subject: Re: Large format color scanner query]]]]
Date: Thu, 13 Nov 2003 08:37:31 -0500 (EST)
From: Ken Grabach <[log in to unmask]>
------------------
There is now a color version of the scanner Diane describes below. It is
sold by Ideal. It will stop when the sheet is grabbed. It will stop if
the sheet is not fed in at a straight angle.
> Ideally we would like a sheet-feed scanner, 36 inches wide or greater,
> that
> can scan up to 400 dpi in color and greyscale, to standard image
> formats
> including TIFF.
The Ideal scanner will do these things. And the images it scans can be
printed very well on the large format HP plotters.
Actually, I think it can go higher than 400 dpi, but we have found 200 to
300 suitable for most maps, and those levels take up far less memory file
space. It's not a scanner problem, but a printer problem, when you get
into such high resolution for items as large as a map. The higher the
density, the longer the time required by the printer. And of course, the
file space issue comes up. We have found that the higher density of
resolution doesn't pay off in a better image quality. Maps with a large
amount of detail can be copied quite nicely at around 300 dpi, and
reproduce very well, indeed, on a good plotter.
Ours is not devoted exclusively to map uses. Probably its most frequent
use is to scan renderings by architecture students; this makes it
necessary to ensure that the scanning heads are clean, as they will pick
up graphite and chalk dust from drawings. However, the scanner works very
well when the heads are clean. If yours is going to be devoted to maps
and other printed materials, this should not be a problem for you.
An important thing to know when ordering a scanner from this company,
is that it will be a long time between placing the order and the arrival
of the equipment.
Ken Grabach <[log in to unmask]>
Maps Librarian
Miami University (Ohio)
Oxford, OH 45056 USA
On Wed, 12 Nov 2003, Johnnie D. Sutherland wrote:
> Date: Wed, 12 Nov 2003 09:52:32 -0500
> From: Diane Schug-O'Neill <[log in to unmask]>
>
>
>
> The two things to keep in mind with sheet-feed scanners are:
> a) will the scanner stop if the sheet is grabbed?
> and
> b) will the scanner stop if the sheet is not fed in at a straight
> angle?
>
> Many of our maps with backing have large bowing issues, where
> the item is warped more than a quarter of an inch.
>
> Ideal.com has a scanner that does the above. My (now retired)
> coworker saw a black & white scanner in action; they now have
> color options. (This demonstration occurred about five years
> ago, before I began working at the Library.) I am told that if
> the color scanner were available our Conservation staff would
> have approved its purchase.
> www.ideal.com
>
> I was able to see a Kirtas demonstration of their book scanner.
> It was very impressive - even with a torn page the suction released
> if any tension was placed on the page.
> www.kirtas-tech.com
>
> Diane
>
> Diane T. Schug-O'Neill
>
> Digital Conversion Specialist
> Geography & Map Division
> Library of Congress
>
> 202-707-2886
> [log in to unmask]
>
>
>
> Christopher Fleet
> Map Library
> National Library of Scotland
> 33 Salisbury Place
> EDINBURGH, EH9 1SL.
> Scotland.
>
> Tel. 0131 466 3813
> Fax. 0131 466 3812
> E-mail: [log in to unmask]
> Map website images: www.nls.uk/maps
>
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