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  4.   <head>
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  6.     <title>7.3.┬áDilate</title>
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  11.     <link rel="up" href="ch06s07.html" title="7.┬áGeneric filters" />
  12.     <link rel="prev" href="ch06s07s02.html" title="7.2.┬áConvolution matrix" />
  13.     <link rel="next" href="ch06s07s04.html" title="7.4.┬áErode" />
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  15.   <body>
  16.     <div xmlns="" class="navheader">
  17.       <table width="100%" summary="Navigation header">
  18.         <tr>
  19.           <th colspan="3" align="center" id="chaptername">7.┬áGeneric filters</th>
  20.         </tr>
  21.         <tr>
  22.           <td width="20%" align="left"><a accesskey="p" href="ch06s07s02.html">Prev</a>┬á</td>
  23.           <th width="60%" align="center" id="sectionname">7.3.┬áDilate</th>
  24.           <td width="20%" align="right">┬á<a accesskey="n" href="ch06s07s04.html">Next</a></td>
  25.         </tr>
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  27.       <hr />
  28.     </div>
  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-dilate"></a>7.3.┬áDilate</h3>
  34.           </div>
  35.         </div>
  36.       </div>
  37.       <a id="id3480353" class="indexterm"></a>
  38.       <div class="simplesect" lang="en" xml:lang="en">
  39.         <div class="titlepage">
  40.           <div>
  41.             <div>
  42.               <h4 class="title"><a id="id3480372"></a>Overview</h4>
  43.             </div>
  44.           </div>
  45.         </div>
  46.         <p>
  47.             This filter is found in 
  48.             <span class="guimenuitem">Image>Filters/Generic/<span class="accel">D</span>ilate</span>  
  49.           </p>
  50.         <p>
  51.             This filter widens and enhances dark areas of the active layer or selection.
  52.           </p>
  53.         <p>
  54.             For every image pixel, it brings the pixel Value (luminosity) into line with 
  55.             the lowest Value (the darkest) of the 8 neighbouring pixels (3x3 matrix). So, 
  56.             a dark pixel is added around dark areas. An isolated pixel on a brighter 
  57.             background will be changed to a big "pixel", composed of 9 pixels, and that will 
  58.             create some noise in the image. 
  59.           </p>
  60.         <div class="mediaobject">
  61.           <img src="../images/filters/filters-dilate-pixel.png" />
  62.         </div>
  63.         <p> 
  64.             In this image, the studied pixel has a red border and the studied matrix has a 
  65.             green border. I hope you have understood how to go on with the process and get a 
  66.             3x3 pixel block: when the "I" pixel is inside the green border, the studied pixel 
  67.             turns to black.
  68.           </p>
  69.         <p>
  70.             A larger dark area will dilate by one pixel in all directions:
  71.           </p>
  72.         <div class="mediaobject">
  73.           <img src="../images/filters/filters-dilate-zone.png" />
  74.         </div>
  75.         <p> 
  76.             The filter was applied 3 times.
  77.           </p>
  78.         <p>
  79.             On more complex images, dark areas are widenned and enhanced the same, and 
  80.             somewhat pixellated. Here, the filter was applied 3 times:
  81.           </p>
  82.         <div class="mediaobject">
  83.           <img src="../images/filters/filters-dilate-image.png" />
  84.         </div>
  85.         <p>
  86.             Of course, if background is darker than foreground, it will cover the whole image. 
  87.           </p>
  88.         <div class="mediaobject">
  89.           <img src="../images/filters/filters-dilate-pixel.png" />
  90.         </div>
  91.         <div class="mediaobject">
  92.           <img src="../images/filters/filters-dilate-zone.png" />
  93.         </div>
  94.         <div class="mediaobject">
  95.           <img src="../images/filters/filters-dilate-image.png" />
  96.         </div>
  97.       </div>
  98.       <div class="simplesect" lang="en" xml:lang="en">
  99.         <div class="titlepage">
  100.           <div>
  101.             <div>
  102.               <h4 class="title"><a id="id3480525"></a>Options</h4>
  103.             </div>
  104.           </div>
  105.         </div>
  106.         <p>
  107.       This filter has no options.
  108.     </p>
  109.       </div>
  110.       <div class="simplesect" lang="en" xml:lang="en">
  111.         <div class="titlepage">
  112.           <div>
  113.             <div>
  114.               <h4 class="title"><a id="id3480537"></a>Examples</h4>
  115.             </div>
  116.           </div>
  117.         </div>
  118.         <div class="variablelist">
  119.           <dl>
  120.             <dt>
  121.               <span class="term">Dilate text</span>
  122.             </dt>
  123.             <dd>
  124.               <div class="mediaobject">
  125.                 <img src="../images/filters/examples/dilate-text.png" />
  126.               </div>
  127.             </dd>
  128.             <dt>
  129.               <span class="term">Dilate neon effect</span>
  130.             </dt>
  131.             <dd>
  132.               <div class="mediaobject">
  133.                 <img src="../images/filters/examples/dilate-neon.png" />
  134.               </div>
  135.             </dd>
  136.           </dl>
  137.         </div>
  138.       </div>
  139.     </div>
  140.     <div class="navfooter">
  141.       <hr />
  142.       <table width="100%" summary="Navigation footer">
  143.         <tr>
  144.           <td width="40%" align="left"><a accesskey="p" href="ch06s07s02.html">Prev</a>┬á</td>
  145.           <td width="20%" align="center">
  146.             <a accesskey="u" href="ch06s07.html">Up</a>
  147.           </td>
  148.           <td width="40%" align="right">┬á<a accesskey="n" href="ch06s07s04.html">Next</a></td>
  149.         </tr>
  150.         <tr>
  151.           <td width="40%" align="left" valign="top">7.2.┬áConvolution matrix┬á</td>
  152.           <td width="20%" align="center">
  153.             <a accesskey="h" href="index.html">Home</a>
  154.           </td>
  155.           <td width="40%" align="right" valign="top">┬á7.4.┬áErode</td>
  156.         </tr>
  157.       </table>
  158.     </div>
  159.   </body>
  160. </html>
  161.