Re: information contained in surrogates

From: Mark Jordan (mjordan@SFU.CA)
Date: Wed May 30 2001 - 18:50:33 CDT

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    Message-Id: <200105302351.QAA28204@dns.ccit.arizona.edu>
Date:         Wed, 30 May 2001 16:50:33 -0700
From: Mark Jordan <mailto:mjordan@SFU.CA>
Subject:      Re: information contained in surrogates
To: mailto:IMAGELIB@LISTSERV.ARIZONA.EDU

    <pre> Hi everybody,

    On Wed, 30 May 2001, Guenter Waibel wrote:

    >
    > If you do the math on the watershed scanning resolutions Nathan
    > Prichard suggests (via Mary Winter), this is what you come up with
    > for filesize for 24 bit files:
    >
    > 35 mm (35x24mm or 1.38 x 0.94 inches) mailto:@ 4000ppi ~ 60 MB
    > 120 (60x 45mm or 2.36 x 1.77 inches) mailto:@ 3000ppi ~ 108 MB
    > 4x5 (4x5 inches) mailto:@ 2000ppi ~ 230 MB
    >
    >

    I'll ask the naive/uninformed question -- what kind of uses of these files requires that much detail? I understand the need for sufficient resolution to zoom in to see fine details in images, and the need to have more than standard monitor output at 72/96 ppi, particulary for preservation but do people actually scan, and preserve, large numbers of images at these high densities? Isn't 400 or 600 ppi a good tradeoff, especially for text-oriented images.

    Mark

    Mark Jordan Librarian / Analyst, Systems Division W.A.C. Bennett Library, Simon Fraser University Burnaby, British Columbia, V5A 1S6, Canada Phone (604) 291 5753 / Fax (604) 291 3023 mailto:mjordan@sfu.ca / http://www.sfu.ca/~mjordan/

    </pre>

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