-------- Original Message --------
Subject:        Re: formats of map compression
Date:   Fri, 23 May 2008 18:00:30 -0400
From:   Jeff Essic <[log in to unmask]>
To:     [log in to unmask]



It's good to know that the format decisions I made recently for our
historic topo maps archive at
http://www.lib.ncsu.edu/gis/historictopos.html are pretty much in
agreement with the comments here.

I'll just add that I decided to provide both a lossy and lossless JPG
2000 version of each scan.  The lossless version is still at least 40%
smaller sized than the original TIFF, and is beautiful when plotted.
Resolution loss with the lossy version is barely noticeable on-screen
although the rectificaton process distorts the pixels slightly.

MrSID will be around for a long time, but for future projects, I think
JPG 2000 is a great way to go.

Jeff


_______________________________________
Jeff Essic, Data Services Librarian
North Carolina State University
D.H. Hill Library, Research & Info. Services Dept.
Box 7111, Raleigh, NC  27695-7111
(919) 515-5698