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<title>Charting the Nation: Technical Specification</title>
<meta name="description" content="Charting the Nation: preserving and widening access to maps of Scotland, 1590-1740">
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<meta name="keywords" content="geography, maps, map, digitisation, project, cartography, history, digital imaging, RSLP, SCRAN, Edinburgh University Library, Scotland">

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<p><img src="graphics/bgtop.jpg" alt="Charting the Nation - Maps of Scotland and associated archives 1550-1740"></p>
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      <p> <a href="index.html">Home</a>
        | <a href="project.html">About the Project</a> | <a href="http://www.ed.ac.uk/schools-departments/information-services/library-museum-gallery/library-help" target="_blank">Contacts<span class='sr-only'> (Opens in a new tab)</span></a>
        | <a href="collab.html">Collaborators</a>
        | <a href="links.html">Useful
            Links</a> | <a href="mapscot.html">Mapping Scotland: An Essay</a> | <a href="copyright.html">Copyright and Reproductions</a> | <a href="accessibility.html" target="_blank">Accessibility<span class='sr-only'> (Opens in a new tab)</span></a><br>
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      <h4 id='main'>Technical Specification (for images created locally by the Charting the Nation project
        team)<sup>(<a href="#one">1</a>)</sup><a name="top1"></a> </h4>
      <h5><strong>Digital camera back</strong>: </h5>
      <p>Phase One PowerPhase&#153;</p>
      <p> Resolution: 7072 x 7072 pixels </p>
      <p> Uninterpolated files (max 143.3 Mb; min 300ppi)</p>
      <p>56mm x 56mm frame capture area</p>
      <p>42bit internal colour depth, 14 bit per colour precision</p>
      <p><strong>Native File format</strong>: Uncompressed TIFF
        files with optional Motorola (Mac) or Intel (PC) byte order and header
        version 6</p>
      <p><strong>Capture software</strong>: Phase One version
        3.1.1 for Power Macintosh</p>
      <p><strong>Camera body</strong>: Hasselblad 501CM</p>
      <p><strong>Lens</strong>: Zeiss 80mm (plus 8mm and 16mm
        extension tubes for close-up work)</p>
      <p><strong>Capture</strong>: Power Mac G4 400Mhz/Apple 21
        inch Studio Monitor with ColorSync</p>
      <p><strong>Post-capture edits</strong>: Adobe Photoshop
        5.0</p>
      <p><strong>Test charts</strong>: Industry standard Kodak
        Q13 colour separation guide (with metric and imperial scales) and grey
        scale for reflected work; Kodak Q60 target for 5x4 transparencies</p>
      <p><strong>Archiving and delivery solutions</strong>: Sony
        DAT DDS3 12Gb tapes (stored off-site) and CD-R Kodak Gold Ultima 650Mb
        (<a href="#two">2</a>) (stored on-site)<a name="top2"></a>. Copies of
        each CD-R were provided to the contributing institutions. Discs were written
        to ISO 660/Joliet format. Kodak claims longevity of 100 years</p>
      <p><strong>Lighting</strong>: 2 Photon Beard 'Highlight'
        studio lights: these are cool running, flicker free, 5,400k balanced fluorescent
        lamps, with a variable output of 2 tubes (110W), 4 tubes (220W), or 6
        tubes (330W). This high colour rendering index (Ra 98) (<a href="#three">3</a>)
        <a name="top3"></a>light source is designed for digital imaging. The lights
        are fitted with Perspex safety screens<br>
        <strong>Light levels</strong>: Using just 4 tubes per light, the measure
        of Lux @ 1m = 10,666 and at 2m = 3,332. Thus at 1m for 15 minutes the
        item being imaged would be subject to 2,666 lux-hrs. (By comparison, the
        standard museum light level for sensitive works on paper is 50 lux. For
        6 weeks display at this level (6-day week, 12-hour day) the object would
        be subject to 26,500 lux-hrs per exhibition). Also, the lights are equipped
        with reflective barn door units. These are employed to screen the object
        from light outside the actual scanning periods, thus reducing light exposure
        to an estimated 2,000 lux-hrs<br>
        <strong>Heat rise</strong>: A preview scan is obtained in circa 15 seconds.
        The scan time for a full high resolution (143Mb) image file is typically
        5-6 minutes using 4 tubes per light. The rise in temperature at the surface
        of the copy table during a typical 15 minute total scanning period using
        4 tubes per light at 1m (i.e. 10,666 Lux) at no time exceeds 1.25 degrees
        C. Tests on-site show that the temperature at the object point on the
        copy table is not more than 1.5 degrees C above the ambient temperature
        of the room at any time<br>
        When used on-site the lights are suspended from an IFF top rail system
        with pantographs. Off-site, the lights are mounted on portable Manfrotto Master
        Stands<br>
        For 5 x 4 transparency copying a Larn electronic high-frequency (cool,
        no-flicker, optimum colour balance, 5300K) lightbox is employed. Transparencies
        are stored in acid-free envelopes</p>
      <p><strong>Archival equipment</strong>: Copy table with
        matt black, soft velvet top surface; Clarkson book supports for bound
        items (large and medium sets), plus snakes; unbleached pure cotton gloves</p>
      ____________________________<br>
      (1)<a name="one"></a> These specifications conform to the Code of Practice
      for the Submission of Digital Imagery as defined by the Digital Imaging
      Group of the Association of Photographers (November 1999). <a href="#top1">Back</a><br>
      (2)<a name="two"></a> Superseded from February 2001 by Kodak CD-R Ultima
      80 (silver-gold alloy, 700Mb). <a href="#top2">Back</a><br>
      (3)<a name="three"></a> A measure of the colour shift objects undergo when
      illuminated by a light source as compared with the colour of those same
      objects when illuminated by a reference source (daylight) at the same colour
      temperature. The index range is from 0 (max shift) to 100 (no shift). <a href="#top3">Back</a>
      <br>

      <p><a href="index.html">Home</a> | <a href="project.html">
              About the Project</a> | <a href="http://www.ed.ac.uk/schools-departments/information-services/library-museum-gallery/library-help" target="_blank">Contacts<span class='sr-only'> (Opens in a new tab)</span></a> | <a href="collab.html">Collaborators</a> | <a href="links.html">Useful Links</a> | <a href="mapscot.html">Mapping Scotland: An Essay</a> | <a href="copyright.html">Copyright and Reproductions</a> | <a href="accessibility.html" target="_blank">Accessibility<span class='sr-only'> (Opens in a new tab)</span></a></p>
      <hr noshade size="1">
      <pre>Published by <a href="http://www.lib.ed.ac.uk">Edinburgh University Library</a> <br>Last Updated: 09-09-2014 </pre>
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