Re: information contained in surrogates

From: Rebecca Anne Moss (mossx014@TC.UMN.EDU)
Date: Wed May 30 2001 - 14:07:28 CDT

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    Message-Id: <200105301910.MAA27638@dns.ccit.arizona.edu>
Date:         Wed, 30 May 2001 14:07:28 -0500
From: Rebecca Anne Moss <mailto:mossx014@TC.UMN.EDU>
Subject:      Re: information contained in surrogates
To: mailto:IMAGELIB@LISTSERV.ARIZONA.EDU

    <pre> Hi all,

    Just to let you know that we in the Slide Library business tend to make our largest file size 18 MB because the top file size on the Photo Cd is roughly 2,000 x 3,000 pixels (about 18 MB). After that, the scans start capturing information about the surface of the slide, rather than the image.

    Rebecca 

    --
Rebecca Anne Moss
Director of Visual Resources
Department of Art History
University of Minnesota
mailto:mossx014@tc.umn.edu
612.624.2064

    Guenter Waibel wrote:

    > Hi folks,
>
> just wanted to say thanks for everybody for the great discussion on
> the data in image surrogates. It'll take me a little while to digest,
> and I've also privately e-mailed some people in the community who may
> no be subsribed to IMAGELIB. I'll keep you posted if anything of
> interest turns up.
>
> 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
>
> Again, the formula: Resolution(ppi) x Resolution(ppi) x Width
> (inches) x Height (inches) x bits per sample (24) gives you the bits
> in the image; divide by 8192 for kilobyte; divide further by 1024 for
> MB. Hope I punched in all the right numbers, but the results look
> good to me :-)
>
> Thanks again, everybody!
>
> 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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