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  1. <?xml version="1.0" encoding="UTF-8" standalone="no"?>
  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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  6.     <title>2.4.┬áSelective Gaussian Blur</title>
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  13.     <link rel="next" href="ch06s02s05.html" title="2.5.┬áMotion Blur" />
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  18.         <tr>
  19.           <th colspan="3" align="center" id="chaptername">2.┬áBlur filters</th>
  20.         </tr>
  21.         <tr>
  22.           <td width="20%" align="left"><a accesskey="p" href="ch06s02s03.html">Prev</a>┬á</td>
  23.           <th width="60%" align="center" id="sectionname">2.4.┬áSelective Gaussian Blur</th>
  24.           <td width="20%" align="right">┬á<a accesskey="n" href="ch06s02s05.html">Next</a></td>
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  31.         <div>
  32.           <div>
  33.             <h3 class="title"><a id="plug-in-selective-blur"></a>2.4.┬áSelective Gaussian Blur</h3>
  34.           </div>
  35.         </div>
  36.       </div>
  37.       <a id="id3472332" class="indexterm"></a>
  38.       <div class="mediaobject">
  39.         <img src="../images/filters/filters-blur-gaussselect.png" />
  40.       </div>
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  42.         <div class="titlepage">
  43.           <div>
  44.             <div>
  45.               <h4 class="title"><a id="id3472363"></a>Overview</h4>
  46.             </div>
  47.           </div>
  48.         </div>
  49.         <p>
  50.       This filter is found in 
  51.       <span class="guimenuitem">Image>Filters/Blur/<span class="accel">S</span>elective Gaussian Blur</span>
  52.     </p>
  53.         <p>
  54.       Contrary to  the other blur plugins, the Selective Gaussian Blur plugin doesn't act on all pixels: 
  55.       blur is applied only if the difference between its value and the value of the surrounding 
  56.       pixels is less than a defined Delta value. So, contrasts are preserved because difference is high on 
  57.       contrast limits. It is used to blur a background so that the foreground subject will stand out 
  58.       better. This add a sense of depth to the image with only a single operation.
  59.     </p>
  60.       </div>
  61.       <div class="simplesect" lang="en" xml:lang="en">
  62.         <div class="titlepage">
  63.           <div>
  64.             <div>
  65.               <h4 class="title"><a id="id3472400"></a>Options</h4>
  66.             </div>
  67.           </div>
  68.         </div>
  69.         <div class="variablelist">
  70.           <dl>
  71.             <dt>
  72.               <span class="term">Blur Radius</span>
  73.             </dt>
  74.             <dd>
  75.               <p>
  76.             Here you can set the blur intensity, in pixels.
  77.           </p>
  78.             </dd>
  79.             <dt>
  80.               <span class="term">Max. Delta</span>
  81.             </dt>
  82.             <dd>
  83.               <p>
  84.             Here you can set the maximum difference (0-255) between the pixel value and the surrounding
  85.             pixel values. Above this Delta, blur will not be applied to that pixel.
  86.           </p>
  87.             </dd>
  88.           </dl>
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  90.       </div>
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  96.           <td width="40%" align="left"><a accesskey="p" href="ch06s02s03.html">Prev</a>┬á</td>
  97.           <td width="20%" align="center">
  98.             <a accesskey="u" href="ch06s02.html">Up</a>
  99.           </td>
  100.           <td width="40%" align="right">┬á<a accesskey="n" href="ch06s02s05.html">Next</a></td>
  101.         </tr>
  102.         <tr>
  103.           <td width="40%" align="left" valign="top">2.3.┬áGaussian Blur┬á</td>
  104.           <td width="20%" align="center">
  105.             <a accesskey="h" href="index.html">Home</a>
  106.           </td>
  107.           <td width="40%" align="right" valign="top">┬á2.5.┬áMotion Blur</td>
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  110.     </div>
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  113.