Newsgroups: sci.image.processing
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From: k9ape@eecs.nwu.edu (Sheldon L. Epstein)
Subject: Re: Handling large image files?
Message-ID: <D2MqCL.EyI@eecs.nwu.edu>
Sender: usenet@eecs.nwu.edu
Organization: EECS Department, Northwestern University
References: <17329BA83S86.DJMOOR1@ukcc.uky.edu>
Date: Thu, 19 Jan 1995 01:48:19 GMT
Lines: 37

In article <17329BA83S86.DJMOOR1@ukcc.uky.edu>,
DAN MOORE <DJMOOR1@ukcc.uky.edu> wrote:
>We are in the early planning stage for setting up a system to view
>and manipulate (clip, move, paste) digitized air-photos.  Doing the
>math, we've determined that each photo will take up 500M --> 1.3 Gb
>if we go with 24 bit color, 600x600 dpi resolution.  The question I
>have is: How are people dealing with these huge files?  We are
>currently using Windows and it is unlikely that we would be able to
>switch operating systems.  So I would like to know if any one is
>manipulating files of this size with Windows software.  Do people
>store these files on CD-rom or on a file server?  If so, how is
>access time?  The traditional method was to store these files on
>tape.  Is this still the state of the art?  If there is a FAQ
>available, please provide a pointer.  Thank you for any information you
>could provide.
> 
>Daniel Moore, Univ. Kentucky-FFOU

For DOS and WINDOWS, we recommend that you consider TAPEDISK Tape Drive
Software from TAPEDISK Corp. (715:235-3388) which allows you to
treat a tape drive -such as an HP 1533A DAT drive with 16 GB Capacity
and 40 second worst case access time - as a WORM DOS Drive.  As we
have implemented it here, we have an AMI Caching SCSI-2 Controller
with 4 MB of cache - which allows us to transfer files at the rate of
about 30 MBytes per minute.  A tape cartridge costs about $15 and the
drive sells for about $1,100.  TAPEDISK sells for about $250.

Working with TAPEDISK Corp. we offer a product called TIO Library which
is a C Object Code Library which permits us to include low-level calls
to the tape drive in our imaging applications programmers.  This is
an advanced-level C programmer product and is not recommended for
the programmers without significant C programming experience.

			Sheldon L. Epstein, k9ape@eecs.nwu.edu
			Chief Engineer
			Epstein Associates
			Wilmette, IL
