Re: Zipping image files

From: Michael Liu (mliu@COMPUPACIFIC.COM)
Date: Mon Jan 28 2002 - 14:50:58 CST

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    Message-Id: <200201282053.g0SKrag14732@sitelicense.arizona.edu>
Date:         Mon, 28 Jan 2002 15:50:58 -0500
From: Michael Liu <mailto:mliu@COMPUPACIFIC.COM>
Subject:      Re: Zipping image files
To: mailto:IMAGELIB@LISTSERV.ARIZONA.EDU

    <pre> Hi David:

    We are an offshore digital content conversion company in Michigan, U.S., with operation centers in China with XML coding
     OCR/ICR and data entering capabilities. Everyday, we need to transfer a lot of TIFF images to China for processing. So, we have some experience on using Winzip.

    Unfortunately the TIFF is a compressed format so WinZip/PkZip will not help you much to decrease file size. I assume whe
     you mentioned images files, they are in TIFF format. Zipping will not affect the image quality when unzipped.

    I think the new compression technology from Lizzard Tech called DjVu could help you on preservation side. They can get s me images to 10% - 20% of the usual TIFF file size. The problem is that currently DjVu is somewhat expensive to use on a large scale scanning project. Once you have saved an image in the DjVu format, people can read the image in a free do nloadable DjVu viewer, similar to Adobe Acrobat Reader for PDF files. There are other new compression technologies comin
     soon, such as Tiff2002 and JBIG, but these are not widely in use now.

    Please let me know anything more we could help.

    Regards Michael Liu CompuPacific International www.compupacific.com 42243 East Ann Arbor Road Plymouth, MI 48170 734-453-9001(phone) 734-657-1042(cell)
    ----- Original Message ----- From: "David Adams" <mailto:David.Adams@NATLIB.GOVT.NZ> To: <mailto:IMAGELIB@LISTSERV.ARIZONA.EDU> Sent: Monday, January 28, 2002 2:41 PM Subject: Zipping image files

    > Does anyone know if there is any form of change to digital image files by using WinZIP or 'zipping' applications?
    >
    > I am interested to know if this will have an affect on TIFF files that are to be used for long term preservation.
    >
    >
    > David Adams
    > Team Leader - Copying and Digital Services
    > National Library of New Zealand
    > +64 4 4743151
    > Visit "Papers Past" Online 19th century New Zealand newspapers
    > http://paperspast.natlib.govt.nz
    > Visit "Timeframes" New Zealands leading source of heritage images
    > http://timeframes.natlib.govt.nz

    </pre>

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