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  2. <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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  4.   <head>
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  6.     <title>5.2.┬áEdge</title>
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  10.     <link rel="start" href="index.html" title="GIMP User Manual" />
  11.     <link rel="up" href="ch06s05.html" title="5.┬áEdge-detect filters" />
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  13.     <link rel="next" href="ch06s05s03.html" title="5.3.┬áDifference of Gaussians" />
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  17.       <table width="100%" summary="Navigation header">
  18.         <tr>
  19.           <th colspan="3" align="center" id="chaptername">5.┬áEdge-detect filters</th>
  20.         </tr>
  21.         <tr>
  22.           <td width="20%" align="left"><a accesskey="p" href="ch06s05.html">Prev</a>┬á</td>
  23.           <th width="60%" align="center" id="sectionname">5.2.┬áEdge</th>
  24.           <td width="20%" align="right">┬á<a accesskey="n" href="ch06s05s03.html">Next</a></td>
  25.         </tr>
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  29.     <div class="sect2" lang="en" xml:lang="en">
  30.       <div class="titlepage">
  31.         <div>
  32.           <div>
  33.             <h3 class="title"><a id="plug-in-edge"></a>5.2.┬áEdge</h3>
  34.           </div>
  35.         </div>
  36.       </div>
  37.       <a id="id3477891" class="indexterm"></a>
  38.       <div class="mediaobject">
  39.         <img src="../images/filters/filters-edgedetect-edge.png" />
  40.       </div>
  41.       <div class="simplesect" lang="en" xml:lang="en">
  42.         <div class="titlepage">
  43.           <div>
  44.             <div>
  45.               <h4 class="title"><a id="id3477913"></a>Overview</h4>
  46.             </div>
  47.           </div>
  48.         </div>
  49.         <p>
  50.       This filter is found in 
  51.       <span class="guimenuitem">Image>/Filters/Edge-Detect/<span class="accel">E</span>dge</span>
  52.     </p>
  53.       </div>
  54.       <div class="simplesect" lang="en" xml:lang="en">
  55.         <div class="titlepage">
  56.           <div>
  57.             <div>
  58.               <h4 class="title"><a id="id3477936"></a>Options</h4>
  59.             </div>
  60.           </div>
  61.         </div>
  62.         <div class="variablelist">
  63.           <dl>
  64.             <dt>
  65.               <span class="term">Algorithm</span>
  66.             </dt>
  67.             <dd>
  68.               <p>
  69.             Edge detector offers several detection methods:     
  70.           </p>
  71.               <p>
  72.             </p>
  73.               <div class="itemizedlist">
  74.                 <ul type="disc">
  75.                   <li>
  76.                     <p>
  77.                 <span class="guilabel">Sobel</span>: Here, this method has no options and so is less
  78.                 interesting than the specific Sobel.
  79.               </p>
  80.                   </li>
  81.                   <li>
  82.                     <p>
  83.                 <span class="guilabel">Prewitt</span>: Result doesn't look different from Sobel.
  84.               </p>
  85.                   </li>
  86.                   <li>
  87.                     <p>
  88.                 <span class="guilabel">Gradient</span>: Edges are thiner, less contrasted and more 
  89.                 blurred than Sobel.
  90.               </p>
  91.                   </li>
  92.                   <li>
  93.                     <p>
  94.                 <span class="guilabel">Roberts</span>: No evident difference from Sobel.
  95.               </p>
  96.                   </li>
  97.                   <li>
  98.                     <p>
  99.                 <span class="guilabel">Differential</span>: Edges less bright.
  100.               </p>
  101.                   </li>
  102.                   <li>
  103.                     <p>
  104.                 <span class="guilabel">Laplace</span>: Less interesting than the specific one.
  105.               </p>
  106.                   </li>
  107.                 </ul>
  108.               </div>
  109.               <p>
  110.           </p>
  111.             </dd>
  112.             <dt>
  113.               <span class="term">Parameter Settings</span>
  114.             </dt>
  115.             <dd>
  116.               <p>
  117.             <span class="guilabel">Amount</span>: 
  118.             a low value results in black, high-contrasted image with thin edges. A high value 
  119.             results in thick edges with low contrast and many colors in dark areas.
  120.           </p>
  121.               <p>
  122.             <span class="guilabel">Wrap, Smear, Black</span>:
  123.             is the Wrapmode like "Displace" plug-in. It's useful for tilable image.
  124.           </p>
  125.             </dd>
  126.           </dl>
  127.         </div>
  128.       </div>
  129.     </div>
  130.     <div class="navfooter">
  131.       <hr />
  132.       <table width="100%" summary="Navigation footer">
  133.         <tr>
  134.           <td width="40%" align="left"><a accesskey="p" href="ch06s05.html">Prev</a>┬á</td>
  135.           <td width="20%" align="center">
  136.             <a accesskey="u" href="ch06s05.html">Up</a>
  137.           </td>
  138.           <td width="40%" align="right">┬á<a accesskey="n" href="ch06s05s03.html">Next</a></td>
  139.         </tr>
  140.         <tr>
  141.           <td width="40%" align="left" valign="top">5.┬áEdge-detect filters┬á</td>
  142.           <td width="20%" align="center">
  143.             <a accesskey="h" href="index.html">Home</a>
  144.           </td>
  145.           <td width="40%" align="right" valign="top">┬á5.3.┬áDifference of Gaussians</td>
  146.         </tr>
  147.       </table>
  148.     </div>
  149.   </body>
  150. </html>
  151.