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  6.     <title>6.4.¬† Erode</title>
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  14.     <link rel="prev" href="plug-in-dilate.html" title="6.3.¬† Dilate" />
  15.     <link rel="next" href="filters-light-and-shadow.html" title="7.¬† Light and Shadow Filters" />
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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">6.4.¬†
  22.     <span lang="en" xml:lang="en">Erode</span>
  23.   </th>
  24.         </tr>
  25.         <tr>
  26.           <td width="20%" align="left"><a accesskey="p" href="plug-in-dilate.html"><img src="../images/prev.png" alt="Prev" /></a>¬†</td>
  27.           <th width="60%" align="center">6.¬†
  28.     <span lang="en" xml:lang="en">Generic Filters</span>
  29.   </th>
  30.           <td width="20%" align="right">¬†<a accesskey="n" href="filters-light-and-shadow.html"><img src="../images/next.png" alt="Next" /></a></td>
  31.         </tr>
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  36.       <div class="titlepage">
  37.         <div>
  38.           <div>
  39.             <h3 class="title"><a id="plug-in-erode"></a>6.4.¬†
  40.     <span lang="en" xml:lang="en">Erode</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: 2436 $</td>
  53.                   <td align="left">2006-12-01</td>
  54.                   <td align="left">j.h</td>
  55.                 </tr>
  56.               </table>
  57.             </div>
  58.           </div>
  59.         </div>
  60.       </div>
  61.       <a id="id2741195" class="indexterm"></a>
  62.       <a id="id2741213" 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="id2741221"></a>6.4.1.¬†
  68.       <span lang="en" xml:lang="en">Overview</span>
  69.     </h4>
  70.             </div>
  71.           </div>
  72.         </div>
  73.         <div class="figure">
  74.           <a id="id2741232"></a>
  75.           <p class="title">
  76.             <b>Figure¬†16.64.¬†
  77.         <span lang="en" xml:lang="en">Erode noise</span>
  78.       </b>
  79.           </p>
  80.           <div class="figure-contents">
  81.             <div class="mediaobject">
  82.               <img src="../images/filters/examples/taj_orig.jpg" alt="Erode noise" />
  83.               <div class="caption">
  84.                 <p>Original image</p>
  85.               </div>
  86.             </div>
  87.             <div class="mediaobject">
  88.               <img src="../images/filters/examples/generic-taj-erode.jpg" alt="Erode noise" />
  89.               <div class="caption">
  90.                 <p>Filter ‚Äú<span class="quote">Erode noise</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">Filte<span class="accel">r</span>s</span> ‚Üí <span class="guisubmenu"><span class="accel">G</span>eneric</span> ‚Üí <span class="guimenuitem">E<span class="accel">r</span>ode</span>
  99.     </p>
  100.         <p>
  101.       This filter widens and enhances bright areas of the active layer or
  102.       selection.
  103.     </p>
  104.         <p>
  105.       For every image pixel, it brings the pixel Value (luminosity) into line
  106.       with the upper Value (the brightest) of the 8 neighbouring pixels (3x3
  107.       matrix). So, a bright pixel is added around bright areas. An isolated
  108.       pixel on a brighter background will be deleted. A larger bright area
  109.       will dilate by one pixel in all directions.
  110.     </p>
  111.         <p>
  112.       On complex images, bright areas are widened and enhanced the same, and
  113.       somewhat pixellated.
  114.     </p>
  115.         <p>
  116.       On a solid background, this filter can delete noise:
  117.       </p>
  118.         <div class="mediaobject">
  119.           <img src="../images/filters/examples/erode-noise.png" />
  120.         </div>
  121.         <p>
  122.     </p>
  123.       </div>
  124.     </div>
  125.     <div class="navfooter">
  126.       <hr />
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  128.         <tr>
  129.           <td width="40%" align="left"><a accesskey="p" href="plug-in-dilate.html"><img src="../images/prev.png" alt="Prev" /></a>¬†</td>
  130.           <td width="20%" align="center">
  131.             <a accesskey="u" href="filters-generic.html">
  132.               <img src="../images/up.png" alt="Up" />
  133.             </a>
  134.           </td>
  135.           <td width="40%" align="right">¬†<a accesskey="n" href="filters-light-and-shadow.html"><img src="../images/next.png" alt="Next" /></a></td>
  136.         </tr>
  137.         <tr>
  138.           <td width="40%" align="left" valign="top"><a accesskey="p" href="plug-in-dilate.html">6.3.¬†
  139.     <span lang="en" xml:lang="en">Dilate</span>
  140.   </a>¬†</td>
  141.           <td width="20%" align="center">
  142.             <a accesskey="h" href="index.html">
  143.               <img src="../images/home.png" alt="Home" />
  144.             </a>
  145.           </td>
  146.           <td width="40%" align="right" valign="top">¬†<a accesskey="n" href="filters-light-and-shadow.html">7.¬†
  147.     <span lang="en" xml:lang="en">Light and Shadow Filters</span>
  148.   </a></td>
  149.         </tr>
  150.       </table>
  151.     </div>
  152.   </body>
  153. </html>
  154.