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  6.     <title>8.15.¬† Wind</title>
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  20.         <tr>
  21.           <th colspan="3" align="center">8.15.¬†
  22.     <span lang="en" xml:lang="en">Wind</span>
  23.   </th>
  24.         </tr>
  25.         <tr>
  26.           <td width="20%" align="left"><a accesskey="p" href="plug-in-vpropagate.html"><img src="../images/prev.png" alt="Prev" /></a>¬†</td>
  27.           <th width="60%" align="center">8.¬†
  28.     <span lang="en" xml:lang="en">Distort Filters</span>
  29.   </th>
  30.           <td width="20%" align="right">¬†<a accesskey="n" href="plug-in-ripple.html"><img src="../images/next.png" alt="Next" /></a></td>
  31.         </tr>
  32.       </table>
  33.       <hr />
  34.     </div>
  35.     <div class="sect2" lang="en" xml:lang="en">
  36.       <div class="titlepage">
  37.         <div>
  38.           <div>
  39.             <h3 class="title"><a id="plug-in-wind"></a>8.15.¬†
  40.     <span lang="en" xml:lang="en">Wind</span>
  41.   </h3>
  42.           </div>
  43.         </div>
  44.       </div>
  45.       <a id="id2754503" class="indexterm"></a>
  46.       <a id="id2754521" class="indexterm"></a>
  47.       <div class="sect3" lang="en" xml:lang="en">
  48.         <div class="titlepage">
  49.           <div>
  50.             <div>
  51.               <h4 class="title"><a id="id2754529"></a>8.15.1.¬†
  52.       <span lang="en" xml:lang="en">Overview</span>
  53.     </h4>
  54.             </div>
  55.           </div>
  56.         </div>
  57.         <div class="figure">
  58.           <a id="id2754540"></a>
  59.           <p class="title">
  60.             <b>Figure¬†16.145.¬†
  61.         <span lang="en" xml:lang="en">
  62.           ‚Äú<span class="quote">Wind</span>‚Äù filter example
  63.         </span>
  64.       </b>
  65.           </p>
  66.           <div class="figure-contents">
  67.             <div class="mediaobject">
  68.               <img src="../images/filters/examples/taj_orig.jpg" alt="Wind filter example" />
  69.               <div class="caption">
  70.                 <p>Original image</p>
  71.               </div>
  72.             </div>
  73.             <div class="mediaobject">
  74.               <img src="../images/filters/examples/distort-taj-wind.jpg" alt="Wind filter example" />
  75.               <div class="caption">
  76.                 <p>Filter ‚Äú<span class="quote">Wind</span>‚Äù applied</p>
  77.               </div>
  78.             </div>
  79.           </div>
  80.         </div>
  81.         <br class="figure-break" />
  82.         <p>
  83.       You can find this filter through
  84.       <span class="guimenu">Filters</span> ‚Üí <span class="guisubmenu">Distorts</span> ‚Üí <span class="guimenuitem">Wind</span>.
  85.     </p>
  86.         <p>
  87.       The Wind filter can be used to create motion blur, but it can
  88.       also be used as a general distort filter. What is characteristic
  89.       about this filter is that it will render thin black or white
  90.       lines. Wind will detect the edges in the image, and stretch out
  91.       thin white or black lines from that edge. This is why you can
  92.       create the illusion of motion, because the edges are what will
  93.       be blurred in a photograph of a moving object.
  94.     </p>
  95.       </div>
  96.       <div class="sect3" lang="en" xml:lang="en">
  97.         <div class="titlepage">
  98.           <div>
  99.             <div>
  100.               <h4 class="title"><a id="id2754655"></a>8.15.2.¬†
  101.       <span lang="en" xml:lang="en">Options</span>
  102.     </h4>
  103.             </div>
  104.           </div>
  105.         </div>
  106.         <div class="figure">
  107.           <a id="id2754666"></a>
  108.           <p class="title">
  109.             <b>Figure¬†16.146.¬†
  110.         <span lang="en" xml:lang="en">
  111.           ‚Äú<span class="quote">Wind</span>‚Äù filter options
  112.         </span>
  113.       </b>
  114.           </p>
  115.           <div class="figure-contents">
  116.             <div class="mediaobject">
  117.               <img src="../images/filters/filters-distort-wind.png" alt="Wind filter options" />
  118.             </div>
  119.           </div>
  120.         </div>
  121.         <br class="figure-break" />
  122.         <p>
  123.       The interface is quite simple. You can set the
  124.       <em class="parameter"><code>Strength</code></em> of the wind and a
  125.       <em class="parameter"><code>Threshold</code></em> value. <em class="parameter"><code>Threshold</code></em>
  126.       will restrict the effect to fewer areas of the image.
  127.       <em class="parameter"><code>Strength</code></em> controls the amount of wind, so a high
  128.       value will render a storm. You can also increase the effect by setting
  129.       the <em class="parameter"><code>Style</code></em> to Blast, which will produce thicker
  130.       lines than Wind.
  131.     </p>
  132.         <p>
  133.       You can only set the wind in two directions, either Left or Right.
  134.       However, you can control which edge the wind will come from using the
  135.       values Leading, Trailing or Both. Because Trailing will produce a black
  136.       wind, it creates a less convincing motion blur than Leading, which will
  137.       produce white wind.
  138.     </p>
  139.         <p>
  140.        The following illustrations are based on this image:
  141.     </p>
  142.         <div class="mediaobject">
  143.           <img src="../images/filters/examples/wind0.png" />
  144.         </div>
  145.         <div class="variablelist">
  146.           <dl>
  147.             <dt>
  148.               <span class="term">Preview</span>
  149.             </dt>
  150.             <dd>
  151.               <p>
  152.             All your setting changes will appear in the Preview without
  153.             affecting the image until you click on <span class="guilabel">OK</span>.
  154.             It reproduces a part of the image only, centred on the first
  155.             modified area it encounters.
  156.           </p>
  157.             </dd>
  158.             <dt>
  159.               <span class="term">Style</span>
  160.             </dt>
  161.             <dd>
  162.               <div class="itemizedlist">
  163.                 <ul type="disc">
  164.                   <li>
  165.                     <p>
  166.                 <span class="guilabel">Wind</span>: This option is the most
  167.                 suggestive of a moving effect. Trails are thin.
  168.               </p>
  169.                   </li>
  170.                   <li>
  171.                     <p>
  172.                 <span class="guilabel">Blast</span>: This option tries to suggest a
  173.                 blast due to an explosion. Trails are thick.
  174.               </p>
  175.                     <div class="mediaobject">
  176.                       <img src="../images/filters/examples/blast1.png" />
  177.                     </div>
  178.                   </li>
  179.                 </ul>
  180.               </div>
  181.             </dd>
  182.             <dt>
  183.               <span class="term">Direction</span>
  184.             </dt>
  185.             <dd>
  186.               <p>
  187.             You can select the direction, <span class="emphasis"><em>Left</em></span> or
  188.             <span class="emphasis"><em>Right</em></span>, from which the wind comes.
  189.           </p>
  190.             </dd>
  191.             <dt>
  192.               <span class="term">Edge Affected</span>
  193.             </dt>
  194.             <dd>
  195.               <div class="itemizedlist">
  196.                 <ul type="disc">
  197.                   <li>
  198.                     <p>
  199.                 <span class="guilabel">Leading</span>: Trails will start from the
  200.                 front border, falling on the object itself. It suggests that
  201.                 a violent wind is pulling color out.
  202.               </p>
  203.                     <div class="mediaobject">
  204.                       <img src="../images/filters/examples/wind2.png" />
  205.                     </div>
  206.                   </li>
  207.                   <li>
  208.                     <p>
  209.                 <span class="guilabel">Trailing</span>: Trails start from the back
  210.                 border of the object.
  211.               </p>
  212.                     <div class="mediaobject">
  213.                       <img src="../images/filters/examples/wind1.png" />
  214.                     </div>
  215.                   </li>
  216.                   <li>
  217.                     <p>
  218.                 <span class="guilabel">Both</span>: Combines both effects.
  219.               </p>
  220.                     <div class="mediaobject">
  221.                       <img src="../images/filters/examples/wind3.png" />
  222.                     </div>
  223.                   </li>
  224.                 </ul>
  225.               </div>
  226.             </dd>
  227.             <dt>
  228.               <span class="term">Threshold</span>
  229.             </dt>
  230.             <dd>
  231.               <p>
  232.             <span class="guilabel">Threshold</span>: The threshold to detect
  233.             borders. The higher it is, the fewer borders
  234.             will be detected.
  235.           </p>
  236.             </dd>
  237.             <dt>
  238.               <span class="term">Strength</span>
  239.             </dt>
  240.             <dd>
  241.               <p>
  242.             <span class="guilabel">Strength</span>:  Higher values increase the
  243.             strength of the effect.
  244.           </p>
  245.             </dd>
  246.           </dl>
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  248.       </div>
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  262.         <tr>
  263.           <td width="40%" align="left" valign="top"><a accesskey="p" href="plug-in-vpropagate.html">8.14.¬†
  264.     <span lang="en" xml:lang="en">Value Propagate</span>
  265.   </a>¬†</td>
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  271.           <td width="40%" align="right" valign="top">¬†<a accesskey="n" href="plug-in-ripple.html">8.16.¬†
  272.     <span lang="en" xml:lang="en">Ripple</span>
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