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<article article-type="research-article">
  <front>
    <journal-meta>
      <journal-id journal-id-type="aggregator">72010604</journal-id>
      <journal-title>Electronic Imaging</journal-title>
      <issn pub-type="ppub">2470-1173</issn><issn pub-type="epub"></issn>
      <publisher>
        <publisher-name>Society for Imaging Science and Technology</publisher-name>
        <publisher-loc>7003 Kilworth Lane, Springfield, VA 22151 USA</publisher-loc>
      </publisher>
    </journal-meta>
    <article-meta>
      <article-id pub-id-type="doi">10.2352/ISSN.2470-1173.2019.14.COLOR-102</article-id>
      <article-id pub-id-type="sici">2470-1173(20190113)2019:14L.1021;1-</article-id>
      <article-id pub-id-type="publisher-id">ei_24701173_v2019n14_r1/s24.xml</article-id>
      <article-id pub-id-type="other">/ist/ei/2019/00002019/00000014/art00023</article-id>
      <article-categories>
        <subj-group>
          <subject>Articles</subject>
        </subj-group>
      </article-categories>
      <title-group>
        <article-title>NPAC FM color halftoning for the Indigo press: challenges and solutions</article-title>
      </title-group>
      <contrib-group>
        <contrib>
          <name>
            <surname>Liu</surname>
            <given-names>Jiayin</given-names>
          </name>
        </contrib>
        <contrib>
          <name>
            <surname>Frank</surname>
            <given-names>Tal</given-names>
          </name>
        </contrib>
        <contrib>
          <name>
            <surname>Ben-Shoshan</surname>
            <given-names>Yotam</given-names>
          </name>
        </contrib>
        <contrib>
          <name>
            <surname>Ulichney</surname>
            <given-names>Robert</given-names>
          </name>
        </contrib>
        <contrib>
          <name>
            <surname>Allebach</surname>
            <given-names>Jan</given-names>
          </name>
        </contrib>
      </contrib-group>
      <pub-date>
        <day>13</day>
        <month>01</month>
        <year>2019</year>
      </pub-date>
      <volume>2019</volume>
      <issue>14</issue>
      <fpage>102-1</fpage>
      <lpage>102-8</lpage>
      <permissions>
        <copyright-year>2019</copyright-year>
      </permissions>
      <abstract>
        <p><italic>FM halftoning is increasingly popular with traditional analog offset lithographic printing processes. There is a desire to offer this capability with digital presses based on electrophotographic printing (EP) technologies. However, the inherent instability of the EP process challenges
 the achievement of satisfactory print quality with dispersed-dot, aperiodic halftoning. The direct binary search (DBS) algorithm is widely considered to represent the gold standard of dispersed-dot, aperiodic halftone image quality. In this paper, we continue our previous efforts to adapt
 DBS to use with the Indigo liquid EP printing technology. We describe a complete color management pipeline for halftoning with a PARAWACS matrix designed using DBS. For the first time, we show actual printed patches obtained using our process.</italic>  <italic>Our gamut mapping is performed in
 the Y<sub>y</sub>C<sub>x</sub>C<sub>z</sub> color space, and is image-dependent. It incorporates several stages of alignment between the input and output spaces, as well as several stages of compression. After the gamut mapping, we tessellate the output color space into six global tetrahedra
 that each share the neutral axis, as an edge. Then, we determine the Neugebauer Primary Area Coverage (NPAC) for each pixel in the image to be printed by tetrahedral interpolation from the four nearest neighbors in the inverse printer mapping table. These four nearest neighbors are chosen
 so that only four Neugebauer primaries are used to render each pixel.</italic></p>
      </abstract>
      <kwd-group>
        <kwd>Color Management</kwd>
        <kwd>Gamut Mapping</kwd>
        <kwd>DBS</kwd>
      </kwd-group>
    </article-meta>
  </front>
</article>
