--- Begin Forwarded Message --- Date: Mon, 12 Jul 99 09:00:03 -0700 From: [log in to unmask] Subject: Archival scanning of maps Sender: [log in to unmask] My email software was doing peculiar things last week, and I'm not sure if this ever went beyond the innards in my pc or not. Apologies if it's a repetition. Is any one in the process of determining the parameters for a scanned ARCHIVAL quality (as compared with access quality) image for historical maps in their collection? What are the considerations/concerns/factors you are using to determine the archival product, the parameters of the scanned image, and derivative products/uses you anticipate creating from the archive? What would be the best archival product? what could be realistically achieved with the currently available technology? Has anyone prepared a 'portfolio' of the same map, scanned at different pixels per inch (e.g., 150, 300, 500, 600, 800, 1000, 1200) levels, with results printed in, say, both color and black and white, or on different types of printers? I'm willing to be very embarrassed if all of this information is in some obvious publication. What I've seen and read - much of it very good, and helpful - focusses on scanning to provide access, or archival scanning of e.g. art images and microfilm. In my library, we've done some scanning of aerial photographs and have developed procedures there, but we've done almost no scanning of maps. If I remember correctly, the Geography and Map Division of the Library of Congress scans at 300 dpi and displays maps at 150dpi (http://memory.loc.gov/ammem/pmhtml/pandigit.html). Mary Larsgaard Map and Imagery Lab, Davidson Library University of California Santa Barbara --- End Forwarded Message ---