Message-Id: <200105302039.NAA17726@dns.ccit.arizona.edu> Date: Wed, 30 May 2001 13:39:05 -0700 From: Bob Savage <mailto:bsavage@STANFORD.EDU> Subject: Re: information contained in surrogates To: mailto:IMAGELIB@LISTSERV.ARIZONA.EDU
<pre>
I was actually going to bring this issue up in a different way: I think the
"information" an image contains depends on your needs when you look at it.
For example, if you are talking about a surrogate for an old photograph, you
might be looking at the overall composition, or identifying subject matter,
or you might be looking at it from a more technical perspective, in which
case the information that is really relevant might be the "crackling"
characteristic of aged albumen prints. Each of these three levels of
information require that the surrogate capture more detail of the original,
than the previous level did.
If you are digitizing a previous surrogate (as is the case in Rebecca Moss's
comment below) you don't want to capture "too much" information, because you
would be capturing information about the previous surrogate that would be
misleading.
On the other hand, if you are capturing information about the original
print, you should probably determine the amount of information to capture
based on your intended use of the digital surrogate. Finally if you need to
err, I would recommend erring on the side of too much information captured
from the original, because a surrogate that forces users to frequently go
back and rehandle the original is useless, or possibly even more harmful,
because it might encourage increased interest in a collection, with
resultant increased handling of the originals.
Bob Savage
-----------------------------
Media Preservation Unit
Stanford University Libraries
mailto:bsavage@stanford.edu
-----Original Message-----
From: IMAGELIB [mailto:mailto:IMAGELIB@LISTSERV.ARIZONA.EDU]On Behalf Of
Rebecca Anne Moss
Sent: Wednesday, May 30, 2001 12:07 PM
To: mailto:IMAGELIB@LISTSERV.ARIZONA.EDU
Subject: Re: information contained in surrogates
Hi all,
Just to let you know that we in the Slide Library business tend to make
our largest file size 18 MB because the top file size on the Photo Cd is
roughly 2,000 x 3,000 pixels (about 18 MB). After that, the scans start
capturing information about the surface of the slide, rather than the
image.
Rebecca
-- Rebecca Anne Moss Director of Visual Resources Department of Art History University of Minnesota mailto:mossx014@tc.umn.edu 612.624.2064</pre>
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