Message-Id: <199906011325.GAA44786@dns.ccit.arizona.edu> Date: Tue, 1 Jun 1999 09:20:05 -0400 From: atroncale <mailto:atroncale@NYPL.ORG> Subject: Re: Digital Camera and Lighting To: mailto:IMAGELIB@LISTSERV.ARIZONA.EDU
Martin:
You might try using daylight florescent lights made by Plume Ltd.
http://www.plumeltd.com/scandle.htm
They are cool enough and UV free enough to be used by several
Conservation Departments in the USA. We have tested them on a Leica S1
Pro digital camera with good results.
As for gilt pages, if your scan times are long enough, try "waving"
your light heads at different angles during the scan process to see if
you can illuminate the gold correctly. I have never tried this
technique, but with some experimentation, it might work.
Good luck with your project and please let me know if you find a
solution, as we are beginning to capture similar materials here at
NYPL.
Anthony Troncale
Associate Head, Digital Unit
New York Public Library
______________________________ Reply Separator _________________________________
Subject: Digital Camera and Lighting
Author: Martin Liebetruth <mailto:liebetru@MAIL.SUB.UNI-GOETTINGEN.DE> at Internet
Date: 6/1/99 12:42 PM
Dies ist eine mehrteilige Nachricht im MIME-Format.
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The State- and University Library in Goettingen, Germany, is
planning to scan older and valuable books, some of them
printed on parchment.
Since we are testing the technical environment
(digital scanback: Picturegate 8000 from Anagramm
[www.anagramm.de], with the principle of a line scanner;
lighting: flourescent lights with Osram Dulux lamps), we
discover several problems.
Especially the heat of the lamps is causing us headaches:
from the preservational point of view, a temperature of
about 22 degrees Celsius is optimal. But tests with the
lamps I mentioned brought us up to 26-28 degrees.
Are there any recommendations or experiences with other
lighting facilities that would meet our goal (daylight
lamps, no heating, constant light)?
Also, we have some problems capturing gilted pages.
This is more a photographical topic, but maybe someone can
give us some advice how to position the lighting.
So far, we discovered that because the gilted pages are not
even and no glasplate can be put upon the valuable material,
the reflexion of the gold is not easy to handle. Parts of
the gilt are fine, others are represented on the screen in
grey or brown colors.
What are your experiences or tips with this special lighting
situation?
Martin Liebetruth
Lower Saxony State- and University Library Goettingen,
Germany
Papendiek 14
D-37070 Goettingen
mailto:liebetru@mail.sub.uni-goettingen.de
http://www.sub.uni-goettingen.de/gdz
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