information contained in surrogates

From: Guenter Waibel (guenter@UCLINK4.BERKELEY.EDU)
Date: Tue May 29 2001 - 17:04:55 CDT

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    Message-Id: <200105292205.PAA22096@dns.ccit.arizona.edu>
Date:         Tue, 29 May 2001 15:04:55 -0700
From: Guenter Waibel <mailto:guenter@UCLINK4.BERKELEY.EDU>
Subject:      information contained in surrogates
To: mailto:IMAGELIB@LISTSERV.ARIZONA.EDU

    <pre> Hi list,

    this is a question tangential to Mary Winter's post. Mary wrote:

    At 12:25 PM -0400 5/29/01, Mary Winter wrote:
    >Basically, you can capture about 3 times the surface area on 4x5 (about a
    >240 meg. file), which could be scanned at 2000dpi (fairly normal for a 4x5
    >film scanner).

    If I understand her correctly (please chime in if I'm misreading you, Mary!), she says that the data contained in a 4x5 transparency is equivalent to 240 MB (I take it at 24 bit RGB color).

    Now this raises an interesting question for me: how much data do analog surrogates contain? Or in other words, at what capture resolution do we exceed the source resolution of the surrogate? Does anybody have information, or leads to information, that spells out the amount of data contained in different types of surrogates in digital terms (resolution of capture, pixel dimension, filesize)? I'd be especially interested in data pertaining to 4x5 transparencies, 35 mm slides, 8x10 prints and also filmstock (16 mm and 35 mm).

    All comments and insights are very much appreciated.

    Thanks, Guenter 

    --
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Guenter Waibel
Berkeley Art Museum & Pacific Film Archive
Digital Media Developer http://www.bampfa.berkeley.edu/
Digital Imaging SIG Chair, MCN http://www.mcn.edu/visig_subscribe.taf
mailto:guenter@uclink4.berkeley.edu
Phone   510-643-8655
Fax     510-642-4889
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

    </pre>

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