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  5.     <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
  6.     <title>5.2.¬† Deinterlace</title>
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  12.     <link rel="start" href="index.html" title="GNU Image Manipulation Program" />
  13.     <link rel="up" href="filters-enhance.html" title="5.¬† Enhance Filters" />
  14.     <link rel="prev" href="filters-enhance.html" title="5.¬† Enhance Filters" />
  15.     <link rel="next" href="plug-in-despeckle.html" title="5.3.¬† Despeckle" />
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  17.   <body>
  18.     <div class="navheader">
  19.       <table width="100%" summary="Navigation header">
  20.         <tr>
  21.           <th colspan="3" align="center">5.2.¬†
  22.     <span lang="en" xml:lang="en">Deinterlace</span>
  23.   </th>
  24.         </tr>
  25.         <tr>
  26.           <td width="20%" align="left"><a accesskey="p" href="filters-enhance.html"><img src="../images/prev.png" alt="Prev" /></a>¬†</td>
  27.           <th width="60%" align="center">5.¬†
  28.     <span lang="en" xml:lang="en">Enhance Filters</span>
  29.   </th>
  30.           <td width="20%" align="right">¬†<a accesskey="n" href="plug-in-despeckle.html"><img src="../images/next.png" alt="Next" /></a></td>
  31.         </tr>
  32.       </table>
  33.       <hr />
  34.     </div>
  35.     <div class="sect2" lang="en" xml:lang="en">
  36.       <div class="titlepage">
  37.         <div>
  38.           <div>
  39.             <h3 class="title"><a id="plug-in-deinterlace"></a>5.2.¬†
  40.     <span lang="en" xml:lang="en">Deinterlace</span>
  41.   </h3>
  42.           </div>
  43.           <div>
  44.             <div class="revhistory">
  45.               <table border="1" width="100%" summary="Revision history">
  46.                 <tr>
  47.                   <th align="left" valign="top" colspan="3">
  48.                     <b>Revision History</b>
  49.                   </th>
  50.                 </tr>
  51.                 <tr>
  52.                   <td align="left">Revision $Revision: 2438 $</td>
  53.                   <td align="left">2006-11-24</td>
  54.                   <td align="left">j.h</td>
  55.                 </tr>
  56.               </table>
  57.             </div>
  58.           </div>
  59.         </div>
  60.       </div>
  61.       <a id="id2737104" class="indexterm"></a>
  62.       <a id="id2737122" class="indexterm"></a>
  63.       <div class="sect3" lang="en" xml:lang="en">
  64.         <div class="titlepage">
  65.           <div>
  66.             <div>
  67.               <h4 class="title"><a id="id2737131"></a>5.2.1.¬†
  68.       <span lang="en" xml:lang="en">Overview</span>
  69.     </h4>
  70.             </div>
  71.           </div>
  72.         </div>
  73.         <p>
  74.       You can find this filter through
  75.       <span class="guimenu">Filters</span> ‚Üí <span class="guisubmenu">Enhance</span> ‚Üí <span class="guimenuitem">Deinterlace</span>.
  76.     </p>
  77.         <p>
  78.       Images captured by videocards, especially when fast movement is
  79.       recorded, may look blurred and stripped, with split objects. This is
  80.       due to how cameras work. They don't record 25 images per second, but 50,
  81.       with half vertical resolution. There are two interlaced images in one
  82.       frame. First line of first image is followed by first line of second
  83.       image followed by second line of first image... etc. So, if there have
  84.       been an important move between the two images, objects will appear
  85.       split, shifted, stripped.
  86.     </p>
  87.         <p>
  88.       The Deinterlace filter keeps only one of both images and replaces
  89.       missing lines by a gradient between previous and following lines. The
  90.       resulting image, or selection, will be somewhat blurred, but can be
  91.       improved by enhance filters
  92.     </p>
  93.         <p>
  94.       You can find interlaced images at
  95.       <a class="ulink" href="http://en.wikipedia.org/wiki/Deinterlace" target="_top">Wikipedia</a>.
  96.     </p>
  97.       </div>
  98.       <div class="sect3" lang="en" xml:lang="en">
  99.         <div class="titlepage">
  100.           <div>
  101.             <div>
  102.               <h4 class="title"><a id="id2737209"></a>5.2.2.¬†
  103.       <span lang="en" xml:lang="en">Options</span>
  104.     </h4>
  105.             </div>
  106.           </div>
  107.         </div>
  108.         <div class="figure">
  109.           <a id="id2737219"></a>
  110.           <p class="title">
  111.             <b>Figure¬†16.43.¬†
  112.         <span lang="en" xml:lang="en">
  113.           Deinterlace filter options
  114.         </span>
  115.       </b>
  116.           </p>
  117.           <div class="figure-contents">
  118.             <div class="mediaobject">
  119.               <img src="../images/filters/options-enhance-deinterlace.png" alt="Deinterlace filter options" />
  120.             </div>
  121.           </div>
  122.         </div>
  123.         <br class="figure-break" />
  124.         <div class="variablelist">
  125.           <dl>
  126.             <dt>
  127.               <span class="term">Preview</span>
  128.             </dt>
  129.             <dd>
  130.               <p>
  131.             When <span class="guilabel">Do preview</span> is checked, parameter
  132.             setting results are interactively displayed in preview.
  133.           </p>
  134.             </dd>
  135.             <dt>
  136.               <span class="term">Mode</span>
  137.             </dt>
  138.             <dd>
  139.               <p>
  140.             <span class="guilabel">Keep odd lines</span> and <span class="guilabel">Keep even
  141.               lines</span>: One of them may render a better result.
  142.             You must try both.
  143.           </p>
  144.             </dd>
  145.           </dl>
  146.         </div>
  147.       </div>
  148.       <div class="sect3" lang="en" xml:lang="en">
  149.         <div class="titlepage">
  150.           <div>
  151.             <div>
  152.               <h4 class="title"><a id="id2737312"></a>5.2.3.¬†
  153.       <span lang="en" xml:lang="en">Example</span>
  154.     </h4>
  155.             </div>
  156.           </div>
  157.         </div>
  158.         <div class="figure">
  159.           <a id="id2737324"></a>
  160.           <p class="title">
  161.             <b>Figure¬†16.44.¬†
  162.         <span lang="en" xml:lang="en">
  163.           Simple applying example for the Deinterlace filter
  164.         </span>
  165.       </b>
  166.           </p>
  167.           <div class="figure-contents">
  168.             <div class="mediaobject">
  169.               <img src="../images/filters/examples/interlaced.png" alt="Simple applying example for the Deinterlace filter" />
  170.               <div class="caption">
  171.                 <p>
  172.             Top : even lines pixels are shifted by one pixel to the right.
  173.             Bottom : one line is missing. These images are zoomed to show
  174.             pixels.
  175.           </p>
  176.               </div>
  177.             </div>
  178.             <div class="mediaobject">
  179.               <img src="../images/filters/examples/deinterlaced-1.png" alt="Simple applying example for the Deinterlace filter" />
  180.               <div class="caption">
  181.                 <p>
  182.             ‚Äú<span class="quote">Keep even fields checked</span>‚Äù.
  183.             Top : odd lines have been shifted to the right, to align
  184.             themselves with the even lines. Bottom: the empty line has been
  185.             filled with red.
  186.           </p>
  187.               </div>
  188.             </div>
  189.             <div class="mediaobject">
  190.               <img src="../images/filters/examples/deinterlaced-2.png" alt="Simple applying example for the Deinterlace filter" />
  191.               <div class="caption">
  192.                 <p>
  193.             ‚Äú<span class="quote">Keep odd fields</span>‚Äù checked.
  194.             Top : even lines have been shifted to the left, to align
  195.             themselves with the odd lines. Bottom: the empty line persists,
  196.             but joins up and down through a gradient.
  197.           </p>
  198.               </div>
  199.             </div>
  200.           </div>
  201.         </div>
  202.         <br class="figure-break" />
  203.       </div>
  204.     </div>
  205.     <div class="navfooter">
  206.       <hr />
  207.       <table width="100%" summary="Navigation footer">
  208.         <tr>
  209.           <td width="40%" align="left"><a accesskey="p" href="filters-enhance.html"><img src="../images/prev.png" alt="Prev" /></a>¬†</td>
  210.           <td width="20%" align="center">
  211.             <a accesskey="u" href="filters-enhance.html">
  212.               <img src="../images/up.png" alt="Up" />
  213.             </a>
  214.           </td>
  215.           <td width="40%" align="right">¬†<a accesskey="n" href="plug-in-despeckle.html"><img src="../images/next.png" alt="Next" /></a></td>
  216.         </tr>
  217.         <tr>
  218.           <td width="40%" align="left" valign="top"><a accesskey="p" href="filters-enhance.html">5.¬†
  219.     <span lang="en" xml:lang="en">Enhance Filters</span>
  220.   </a>¬†</td>
  221.           <td width="20%" align="center">
  222.             <a accesskey="h" href="index.html">
  223.               <img src="../images/home.png" alt="Home" />
  224.             </a>
  225.           </td>
  226.           <td width="40%" align="right" valign="top">¬†<a accesskey="n" href="plug-in-despeckle.html">5.3.¬†
  227.     <span lang="en" xml:lang="en">Despeckle</span>
  228.   </a></td>
  229.         </tr>
  230.       </table>
  231.     </div>
  232.   </body>
  233. </html>
  234.