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  6.     <title>10.16.┬áWind</title>
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  17.       <table width="100%" summary="Navigation header">
  18.         <tr>
  19.           <th colspan="3" align="center" id="chaptername">10.┬áDistort filters</th>
  20.         </tr>
  21.         <tr>
  22.           <td width="20%" align="left"><a accesskey="p" href="ch06s10s15.html">Prev</a>┬á</td>
  23.           <th width="60%" align="center" id="sectionname">10.16.┬áWind</th>
  24.           <td width="20%" align="right">┬á<a accesskey="n" href="ch06s11.html">Next</a></td>
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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-wind"></a>10.16.┬áWind</h3>
  34.           </div>
  35.         </div>
  36.       </div>
  37.       <a id="id3486434" class="indexterm"></a>
  38.       <div class="mediaobject">
  39.         <img src="../images/filters/filters-distort-wind.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="id3486456"></a>Overview</h4>
  46.             </div>
  47.           </div>
  48.         </div>
  49.         <p>
  50.             This filter is found in 
  51.             <span class="guimenuitem">Image>Filters/Distorts/Wi<span class="accel">n</span>d</span>.
  52.           </p>
  53.         <p>
  54.             The Wind filter can be used to create motion blur, but it can
  55.             also be used as a general distort filter. What is characteristic
  56.             about this filter is that it will render thin black or white
  57.             lines. Wind will detect the edges in the image, and stretch out
  58.             thin white or black lines from that edge. This is why you can
  59.             create the illusion of motion, because the edges are what will
  60.             be blurred in a photograph of a moving object. 
  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="id3486493"></a>Preview</h4>
  68.             </div>
  69.           </div>
  70.         </div>
  71.         <p>
  72.       All your setting changes will appear in the Preview without 
  73.       affecting the image until you click on <span class="guilabel">OK</span>. 
  74.       It reproduces a part of the image only, centred on the first 
  75.       modified area it encounters.
  76.     </p>
  77.       </div>
  78.       <div class="simplesect" lang="en" xml:lang="en">
  79.         <div class="titlepage">
  80.           <div>
  81.             <div>
  82.               <h4 class="title"><a id="id3486514"></a>Parameter Settings</h4>
  83.             </div>
  84.           </div>
  85.         </div>
  86.         <p>
  87.       The interface is quite simple. You can set the
  88.       <i class="parameter"><tt>Strength</tt></i> of the 
  89.       wind and a <i class="parameter"><tt>Threshold</tt></i>
  90.       value. <i class="parameter"><tt>Threshold</tt></i> will restrict the effect 
  91.       to fewer areas of the image. <i class="parameter"><tt>Strength</tt></i>
  92.       controls the amount of 
  93.       wind, so a high value will render a storm. You can also increase
  94.       the effect by setting the <i class="parameter"><tt>Style</tt></i> to Blast,
  95.       which will produce 
  96.       thicker lines than Wind. 
  97.     </p>
  98.         <p>
  99.       You can only set the wind in two directions, either Left or
  100.        Right. However, you can control which edge the wind will come
  101.        from using the values Leading, Trailing or Both. Because
  102.        Trailing will produce a black wind, it creates a less
  103.        convincing motion blur than Leading, which will produce white
  104.        wind.
  105.     </p>
  106.         <p>
  107.        The following illustrations are based on this image: 
  108.  
  109.       </p>
  110.         <div class="mediaobject">
  111.           <img src="../images/filters/examples/wind0.png" />
  112.         </div>
  113.         <p>            
  114.     </p>
  115.         <div class="variablelist">
  116.           <dl>
  117.             <dt>
  118.               <span class="term">Style</span>
  119.             </dt>
  120.             <dd>
  121.               <div class="itemizedlist">
  122.                 <ul type="disc">
  123.                   <li>
  124.                     <p>
  125.               <span class="guilabel">Wind</span>: This option is the most 
  126.               suggestive of a moving effect. Trails are thin.
  127.             </p>
  128.                   </li>
  129.                   <li>
  130.                     <p>
  131.               <span class="guilabel">Blast</span>: This option tries to suggest a 
  132.               blast due to an explosion. Trails are thick. 
  133.               </p>
  134.                     <div class="mediaobject">
  135.                       <img src="../images/filters/examples/blast1.png" />
  136.                     </div>
  137.                     <p>
  138.             </p>
  139.                   </li>
  140.                 </ul>
  141.               </div>
  142.             </dd>
  143.             <dt>
  144.               <span class="term">Direction</span>
  145.             </dt>
  146.             <dd>
  147.               <p>
  148.             You can select the direction, <span class="emphasis"><em>Left</em></span> or 
  149.             <span class="emphasis"><em>Right</em></span>, from which the wind comes.
  150.           </p>
  151.             </dd>
  152.             <dt>
  153.               <span class="term">Edge Affected</span>
  154.             </dt>
  155.             <dd>
  156.               <div class="itemizedlist">
  157.                 <ul type="disc">
  158.                   <li>
  159.                     <p>
  160.               <span class="guilabel">Leading</span>: Trails will start from the 
  161.               front border, falling on the object itself. It suggests that 
  162.               a violent wind is pulling color out.                
  163.               </p>
  164.                     <div class="mediaobject">
  165.                       <img src="../images/filters/examples/wind2.png" />
  166.                     </div>
  167.                     <p>
  168.             </p>
  169.                   </li>
  170.                   <li>
  171.                     <p>
  172.               <span class="guilabel">Trailing</span>: Trails start from the back 
  173.               border of the object.
  174.               </p>
  175.                     <div class="mediaobject">
  176.                       <img src="../images/filters/examples/wind1.png" />
  177.                     </div>
  178.                     <p>
  179.             </p>
  180.                   </li>
  181.                   <li>
  182.                     <p>
  183.               <span class="guilabel">Both</span>: Combines both effects.
  184.               </p>
  185.                     <div class="mediaobject">
  186.                       <img src="../images/filters/examples/wind3.png" />
  187.                     </div>
  188.                     <p>
  189.             </p>
  190.                   </li>
  191.                 </ul>
  192.               </div>
  193.             </dd>
  194.             <dt>
  195.               <span class="term">Other Settings</span>
  196.             </dt>
  197.             <dd>
  198.               <div class="itemizedlist">
  199.                 <ul type="disc">
  200.                   <li>
  201.                     <p>
  202.                 <span class="guilabel">Threshold</span>: The threshold to detect 
  203.                 borders. The higher it is, the fewer borders 
  204.                 will be detected.
  205.               </p>
  206.                   </li>
  207.                   <li>
  208.                     <p>
  209.                 <span class="guilabel">Strength</span>:  Higher values increase the 
  210.                 strength of the effect.
  211.               </p>
  212.                   </li>
  213.                 </ul>
  214.               </div>
  215.             </dd>
  216.           </dl>
  217.         </div>
  218.       </div>
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  224.           <td width="40%" align="left"><a accesskey="p" href="ch06s10s15.html">Prev</a>┬á</td>
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