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  1. <?xml version="1.0" encoding="UTF-8" standalone="no"?>
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  4.   <head>
  5.     <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
  6.     <title>4.6.¬† Sobel</title>
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  12.     <link rel="start" href="index.html" title="GNU Image Manipulation Program" />
  13.     <link rel="up" href="filters-edge.html" title="4.¬† Edge-Detect Filters" />
  14.     <link rel="prev" href="plug-in-neon.html" title="4.5.¬† Neon" />
  15.     <link rel="next" href="filters-enhance.html" title="5.¬† Enhance Filters" />
  16.   </head>
  17.   <body>
  18.     <div class="navheader">
  19.       <table width="100%" summary="Navigation header">
  20.         <tr>
  21.           <th colspan="3" align="center">4.6.¬†
  22.     <span lang="en" xml:lang="en">Sobel</span>
  23.   </th>
  24.         </tr>
  25.         <tr>
  26.           <td width="20%" align="left"><a accesskey="p" href="plug-in-neon.html"><img src="../images/prev.png" alt="Prev" /></a>¬†</td>
  27.           <th width="60%" align="center">4.¬†
  28.     <span lang="en" xml:lang="en">Edge-Detect Filters</span>
  29.   </th>
  30.           <td width="20%" align="right">¬†<a accesskey="n" href="filters-enhance.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-sobel"></a>4.6.¬†
  40.     <span lang="en" xml:lang="en">Sobel</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: 2440 $</td>
  53.                   <td align="left">2006-11-20</td>
  54.                   <td align="left">j.h</td>
  55.                 </tr>
  56.               </table>
  57.             </div>
  58.           </div>
  59.         </div>
  60.       </div>
  61.       <a id="id2736703" class="indexterm"></a>
  62.       <a id="id2736721" 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="id2736730"></a>4.6.1.¬†
  68.       <span lang="en" xml:lang="en">Overview</span>
  69.     </h4>
  70.             </div>
  71.           </div>
  72.         </div>
  73.         <div class="figure">
  74.           <a id="id2736740"></a>
  75.           <p class="title">
  76.             <b>Figure¬†16.41.¬†
  77.         <span lang="en" xml:lang="en">Applying example of the Sobel filter</span>
  78.       </b>
  79.           </p>
  80.           <div class="figure-contents">
  81.             <div class="mediaobject">
  82.               <img src="../images/filters/examples/taj_orig.jpg" alt="Applying example of the Sobel filter" />
  83.               <div class="caption">
  84.                 <p>Original image</p>
  85.               </div>
  86.             </div>
  87.             <div class="mediaobject">
  88.               <img src="../images/filters/examples/edge-taj-sobel.jpg" alt="Applying example of the Sobel filter" />
  89.               <div class="caption">
  90.                 <p>Filter ‚Äú<span class="quote">Sobel</span>‚Äù applied</p>
  91.               </div>
  92.             </div>
  93.           </div>
  94.         </div>
  95.         <br class="figure-break" />
  96.         <p>
  97.       You can find this filter through
  98.       <span class="guimenu">Filters</span> ‚Üí <span class="guisubmenu">Edge detect</span> ‚Üí <span class="guimenuitem"><span class="accel">S</span>obel</span>.
  99.     </p>
  100.         <p>
  101.       Sobel's filter detects horizontal and vertical edges separately on a
  102.       scaled image. Color images are turned into RGB scaled images. As with
  103.       the Laplace filter, the result is a transparent image with black lines
  104.       and some rest of colors.
  105.     </p>
  106.       </div>
  107.       <div class="sect3" lang="en" xml:lang="en">
  108.         <div class="titlepage">
  109.           <div>
  110.             <div>
  111.               <h4 class="title"><a id="id2736851"></a>4.6.2.¬†
  112.       <span lang="en" xml:lang="en">Options</span>
  113.     </h4>
  114.             </div>
  115.           </div>
  116.         </div>
  117.         <div class="figure">
  118.           <a id="id2736862"></a>
  119.           <p class="title">
  120.             <b>Figure¬†16.42.¬†
  121.         <span lang="en" xml:lang="en">
  122.           Sobel filter options
  123.         </span>
  124.       </b>
  125.           </p>
  126.           <div class="figure-contents">
  127.             <div class="mediaobject">
  128.               <img src="../images/filters/sobel-options.png" alt="Sobel filter options" />
  129.             </div>
  130.           </div>
  131.         </div>
  132.         <br class="figure-break" />
  133.         <div class="variablelist">
  134.           <dl>
  135.             <dt>
  136.               <span class="term">Parameters Settings</span>
  137.             </dt>
  138.             <dd>
  139.               <div class="itemizedlist">
  140.                 <ul type="disc">
  141.                   <li>
  142.                     <p>
  143.                 <span class="guilabel">Sobel Horizontally</span>: Renders near
  144.                 horizontal edges.
  145.               </p>
  146.                   </li>
  147.                   <li>
  148.                     <p>
  149.                 <span class="guilabel">Sobel Vertically</span>: Renders near
  150.                 vertical edges.
  151.               </p>
  152.                   </li>
  153.                   <li>
  154.                     <p>
  155.                 <span class="guilabel">Keep sign of result</span>: This option works
  156.                 when one and only one direction is selected: it gives a
  157.                 flat relief with bumps and hollows to the image.
  158.               </p>
  159.                   </li>
  160.                 </ul>
  161.               </div>
  162.             </dd>
  163.           </dl>
  164.         </div>
  165.       </div>
  166.     </div>
  167.     <div class="navfooter">
  168.       <hr />
  169.       <table width="100%" summary="Navigation footer">
  170.         <tr>
  171.           <td width="40%" align="left"><a accesskey="p" href="plug-in-neon.html"><img src="../images/prev.png" alt="Prev" /></a>¬†</td>
  172.           <td width="20%" align="center">
  173.             <a accesskey="u" href="filters-edge.html">
  174.               <img src="../images/up.png" alt="Up" />
  175.             </a>
  176.           </td>
  177.           <td width="40%" align="right">¬†<a accesskey="n" href="filters-enhance.html"><img src="../images/next.png" alt="Next" /></a></td>
  178.         </tr>
  179.         <tr>
  180.           <td width="40%" align="left" valign="top"><a accesskey="p" href="plug-in-neon.html">4.5.¬†
  181.     <span lang="en" xml:lang="en">Neon</span>
  182.   </a>¬†</td>
  183.           <td width="20%" align="center">
  184.             <a accesskey="h" href="index.html">
  185.               <img src="../images/home.png" alt="Home" />
  186.             </a>
  187.           </td>
  188.           <td width="40%" align="right" valign="top">¬†<a accesskey="n" href="filters-enhance.html">5.¬†
  189.     <span lang="en" xml:lang="en">Enhance Filters</span>
  190.   </a></td>
  191.         </tr>
  192.       </table>
  193.     </div>
  194.   </body>
  195. </html>
  196.