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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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  4.   <head>
  5.     <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
  6.     <title>2.5.┬áSelective Gaussian Blur</title>
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  11.     <link rel="up" href="ch05s02.html" title="2.┬áBlur filters" />
  12.     <link rel="previous" href="ch05s02s04.html" title="2.4.┬áGaussian Blur (RLE)" />
  13.     <link rel="next" href="ch05s02s06.html" title="2.6.┬áMotion Blur" />
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  15.   <body>
  16.     <div class="navheader">
  17.       <table width="100%" summary="Navigation header">
  18.         <tr>
  19.           <th colspan="3" align="center">2.5.┬áSelective Gaussian Blur</th>
  20.         </tr>
  21.         <tr>
  22.           <td width="20%" align="left"><a accesskey="p" href="ch05s02s04.html">Prev</a>┬á</td>
  23.           <th width="60%" align="center">2.┬áBlur filters</th>
  24.           <td width="20%" align="right">┬á<a accesskey="n" href="ch05s02s06.html">Next</a></td>
  25.         </tr>
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  27.       <hr />
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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="filters-blur-gaussselect"></a>2.5.┬áSelective Gaussian Blur</h3>
  34.           </div>
  35.         </div>
  36.         <div></div>
  37.       </div>
  38.       <a id="id2969228" class="indexterm"></a>
  39.       <div class="mediaobject">
  40.         <img src="../images/filters/filters-blur-gaussselect.png" />
  41.       </div>
  42.       <div class="simplesect" lang="en" xml:lang="en">
  43.         <div class="titlepage">
  44.           <div>
  45.             <div>
  46.               <h4 class="title"><a id="id2969265"></a>Overview</h4>
  47.             </div>
  48.           </div>
  49.           <div></div>
  50.         </div>
  51.         <p>
  52.       This filter is found in 
  53.       <span class="guimenuitem">Image>Filters/Blur/<span class="accel">S</span>elective Gaussian Blur</span>
  54.     </p>
  55.         <p>
  56.       Contrary to  the other blur plugins, the Selective Gaussian Blur plugin doesn't act on all pixels: 
  57.       blur is applied only if the difference between its value and the value of the surrounding 
  58.       pixels is less than a defined Delta value. So, contrasts are preserved because difference is high on 
  59.       contrast limits. It is used to blur a background so that the foreground subject will stand out 
  60.       better. This add a sense of depth to the image with only a single operation.
  61.     </p>
  62.       </div>
  63.       <div class="simplesect" lang="en" xml:lang="en">
  64.         <div class="titlepage">
  65.           <div>
  66.             <div>
  67.               <h4 class="title"><a id="id2969302"></a>Options</h4>
  68.             </div>
  69.           </div>
  70.           <div></div>
  71.         </div>
  72.         <div class="variablelist">
  73.           <dl>
  74.             <dt>
  75.               <span class="term">Blur Radius</span>
  76.             </dt>
  77.             <dd>
  78.               <p>
  79.             Here you can set the blur intensity, in pixels.
  80.           </p>
  81.             </dd>
  82.             <dt>
  83.               <span class="term">Max. Delta</span>
  84.             </dt>
  85.             <dd>
  86.               <p>
  87.             Here you can set the maximum difference (0-255) between the pixel value and the surrounding
  88.             pixel values. Above this Delta, blur will not be applied to that pixel.
  89.           </p>
  90.             </dd>
  91.           </dl>
  92.         </div>
  93.       </div>
  94.     </div>
  95.     <div class="navfooter">
  96.       <hr />
  97.       <table width="100%" summary="Navigation footer">
  98.         <tr>
  99.           <td width="40%" align="left"><a accesskey="p" href="ch05s02s04.html">Prev</a>┬á</td>
  100.           <td width="20%" align="center">
  101.             <a accesskey="u" href="ch05s02.html">Up</a>
  102.           </td>
  103.           <td width="40%" align="right">┬á<a accesskey="n" href="ch05s02s06.html">Next</a></td>
  104.         </tr>
  105.         <tr>
  106.           <td width="40%" align="left" valign="top">2.4.┬áGaussian Blur (RLE)┬á</td>
  107.           <td width="20%" align="center">
  108.             <a accesskey="h" href="index.html">Home</a>
  109.           </td>
  110.           <td width="40%" align="right" valign="top">┬á2.6.┬áMotion Blur</td>
  111.         </tr>
  112.       </table>
  113.     </div>
  114.   </body>
  115. </html>
  116.