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  6.     <title>12.6.┬áDiffraction Patterns</title>
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  18.         <tr>
  19.           <th colspan="3" align="center" id="chaptername">12.┬áRendering filters</th>
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  21.         <tr>
  22.           <td width="20%" align="left"><a accesskey="p" href="ch06s12s05.html">Prev</a>┬á</td>
  23.           <th width="60%" align="center" id="sectionname">12.6.┬áDiffraction Patterns</th>
  24.           <td width="20%" align="right">┬á<a accesskey="n" href="ch06s12s07.html">Next</a></td>
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  30.       <div class="titlepage">
  31.         <div>
  32.           <div>
  33.             <h3 class="title"><a id="plug-in-diffraction"></a>12.6.┬áDiffraction Patterns</h3>
  34.           </div>
  35.         </div>
  36.       </div>
  37.       <a id="id3490221" class="indexterm"></a>
  38.       <div class="mediaobject">
  39.         <img src="../images/filters/filters-render-diffraction.png" />
  40.       </div>
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  42.         <div class="titlepage">
  43.           <div>
  44.             <div>
  45.               <h4 class="title"><a id="id3490253"></a>Overview</h4>
  46.             </div>
  47.           </div>
  48.         </div>
  49.         <div class="table">
  50.           <a id="id3490260"></a>
  51.           <p class="title">
  52.             <b>Table┬á6.1.┬á
  53.         Two examples of diffraction patterns.
  54.       </b>
  55.           </p>
  56.           <table summary="         Two examples of diffraction patterns.       " border="0">
  57.             <colgroup>
  58.               <col />
  59.               <col />
  60.             </colgroup>
  61.             <tbody>
  62.               <tr>
  63.                 <td>
  64.         <div class="mediaobject"><img src="../images/filters/examples/diffraction1.png" /></div>
  65.             </td>
  66.                 <td>
  67.         <div class="mediaobject"><img src="../images/filters/examples/diffraction2.png" /></div>
  68.             </td>
  69.               </tr>
  70.             </tbody>
  71.           </table>
  72.         </div>
  73.         <p>
  74.       This filter is found in 
  75.       <span class="guimenuitem">Image>Filters/Render/Pattern<span class="accel">D</span>iffraction Patterns...</span>.
  76.     </p>
  77.         <p>
  78.       This filter lets you make diffraction or wave interference
  79.       textures. You can change the Frequency, Contours and Sharp Edges
  80.       for each of the RGB channels.  You can also set Brightness,
  81.       Scattering and Polarization of the texture. There is no
  82.       automatic preview, so you must press the preview button to
  83.       update. On a slow system, this may take a bit of time.
  84.     </p>
  85.         <p>
  86.       This is a very useful filter if you want to create
  87.       intricate patterns. It's perfect for making psychedelic,
  88.       batik-like textures, or for imitating patterns in stained glass
  89.       (as in a church window).  
  90.     </p>
  91.         <p>
  92.       It seems clear that the plugin works by simulating the physics
  93.       of light striking a grating.  Unfortunately, the original
  94.       authors never got around to writing down the theory behind it,
  95.       or explaining what the parameters mean.  The best approach,
  96.       then, is just to twiddle things and see what happens.
  97.       Fortunately, almost anything you do seems to produce interesting
  98.       results.
  99.     </p>
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  113.           <td width="40%" align="left" valign="top">12.5.┬áIFS Compose┬á</td>
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  115.             <a accesskey="h" href="index.html">Home</a>
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  117.           <td width="40%" align="right" valign="top">┬á12.7.┬áGrid</td>
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