Information contained in Surrogates

From: SonC (Sonny Carter) (cartersn@ALPHA.NSULA.EDU)
Date: Tue May 29 2001 - 18:11:34 CDT

  • Next message: Andrew Stawowczyk Long: "Re: information contained in surrogates" 

    Message-Id: <200105300006.RAA09452@dns.ccit.arizona.edu>
Date:         Tue, 29 May 2001 18:11:34 -0500
From: "SonC (Sonny Carter)" <mailto:cartersn@ALPHA.NSULA.EDU>
Subject:      Information contained in Surrogates
To: mailto:IMAGELIB@LISTSERV.ARIZONA.EDU

    <pre> Guenter,

    I think you're on to something. Today I scanned a pic at the same levels described as the limits to the Leica S1 Pro. When looking at the output in Photoshop, I magnified the image and I was deep into grain of the original photo long before I reached the point pixels show, and the original image head (size of my fingernail) on the photo filled a 19 inch screen in IE5.

    I think I read somewhere that the actual resolution of an 8x10 print blown up from a tri-x negative was about 300 dpi.

    Check out this page on the subject on Wayne Fulton's excellent site. I found it linked from Microtek's European Website.

    http://www.scantips.com/basics08.html

    Regards,

    SonC (Sonny Carter) Cammie G. Henry Research Center Northwestern State Univesity of Louisiana

    http://www.sonc.com

    ----- Original Message ----- From: Guenter Waibel <mailto:guenter@UCLINK4.BERKELEY.EDU> To: <mailto:IMAGELIB@LISTSERV.ARIZONA.EDU> Sent: Tuesday, May 29, 2001 5:04 PM Subject: information contained in surrogates

    > 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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