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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>10.15.┬áWhirl and Pinch</title>
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  11.     <link rel="up" href="ch06s10.html" title="10.┬áDistort filters" />
  12.     <link rel="prev" href="ch06s10s14.html" title="10.14.┬áWaves" />
  13.     <link rel="next" href="ch06s10s16.html" title="10.16.┬áWind" />
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  15.   <body>
  16.     <div xmlns="" class="navheader">
  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="ch06s10s14.html">Prev</a>┬á</td>
  23.           <th width="60%" align="center" id="sectionname">10.15.┬áWhirl and Pinch</th>
  24.           <td width="20%" align="right">┬á<a accesskey="n" href="ch06s10s16.html">Next</a></td>
  25.         </tr>
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  27.       <hr />
  28.     </div>
  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-whirlpinch"></a>10.15.┬áWhirl and Pinch</h3>
  34.           </div>
  35.         </div>
  36.       </div>
  37.       <a id="id3486156" class="indexterm"></a>
  38.       <div class="mediaobject">
  39.         <img src="../images/filters/filters-distort-whirlpinch.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="id3486178"></a>Overview</h4>
  46.             </div>
  47.           </div>
  48.         </div>
  49.         <p>
  50.       This filter is found in
  51.       <span class="guimenu">Filters</span>-><span class="guisubmenu">Distorts</span>-><span class="guimenuitem">W<span class="accel">h</span>irl and Pinch</span>
  52.     </p>
  53.         <p>
  54.       "Whirl and Pinch" distorts your image in a concentric way.
  55.     </p>
  56.         <p>
  57.       "Whirl" distorts the image much like the little whirlpool that
  58.       appears when you empty your bath. 
  59.     </p>
  60.         <p>
  61.       "Pinch" can be compared to applying your image to a soft rubber
  62.       surface and squeezing the edges or corners. If the Pinch amount
  63.       slider is set to a negative value, it will look as if someone
  64.       tried to push a round object up toward you from behind the
  65.       rubber skin. If the Pinch amount is set to a positive value, it
  66.       looks like someone is dragging or sucking on the surface from
  67.       behind, and away from you. 
  68.     </p>
  69.         <div class="tip" style="margin-left: 0.5in; margin-right: 0.5in;">
  70.           <table border="0" summary="Tip">
  71.             <tr>
  72.               <td rowspan="2" align="center" valign="top" width="25">
  73.                 <img alt="[Tip]" src="../images/tip.png" />
  74.               </td>
  75.               <th align="left">Tip</th>
  76.             </tr>
  77.             <tr>
  78.               <td colspan="2" align="left" valign="top">
  79.                 <p>
  80.     The "pinch" effect can sometimes be used to compensate for image
  81.     distortion produced by telephoto or fisheye lenses ("barrel
  82.     distortion"). 
  83.       </p>
  84.               </td>
  85.             </tr>
  86.           </table>
  87.         </div>
  88.       </div>
  89.       <div class="simplesect" lang="en" xml:lang="en">
  90.         <div class="titlepage">
  91.           <div>
  92.             <div>
  93.               <h4 class="title"><a id="id3486247"></a>Parameter Settings</h4>
  94.             </div>
  95.           </div>
  96.         </div>
  97.         <div class="informaltable">
  98.           <table border="0">
  99.             <colgroup>
  100.               <col />
  101.               <col />
  102.               <col />
  103.             </colgroup>
  104.             <tbody>
  105.               <tr>
  106.                 <td>
  107.                   <div class="mediaobject">
  108.                     <img src="../images/filters/examples/whirlpinch-orig.png" />
  109.                   </div>
  110.                 </td>
  111.                 <td>
  112.                   <div class="mediaobject">
  113.                     <img src="../images/filters/examples/whirlpinch-whirl.png" />
  114.                   </div>
  115.                 </td>
  116.                 <td>
  117.                   <div class="mediaobject">
  118.                     <img src="../images/filters/examples/whirlpinch-pinch.png" />
  119.                   </div>
  120.                 </td>
  121.               </tr>
  122.               <tr>
  123.                 <td align="center">
  124.           <p>Original</p>
  125.         </td>
  126.                 <td align="center">
  127.           <p>Whirled</p>
  128.         </td>
  129.                 <td align="center">
  130.           <p>Pinched</p>
  131.         </td>
  132.               </tr>
  133.             </tbody>
  134.           </table>
  135.         </div>
  136.         <p>
  137.       Changes to parameters are immediately displayed into the 
  138.       <span class="emphasis"><em>Preview</em></span>. The whirlpool is focused around the 
  139.       center of the current layer or selection.
  140.     </p>
  141.         <p>
  142.             <span class="guilabel">Whirl Angle</span>: Clockwise or counter 
  143.             clockwise (-360 to +360). Controls how many degrees the
  144.             affected part of the image is rotated.   
  145.           </p>
  146.         <p>
  147.             <span class="guilabel">Pinch Amount</span>: Whirlpool depth(-1 to
  148.             +1).  Determines how strongly the affected part of the
  149.             image is pinched.
  150.           </p>
  151.         <p>
  152.             <span class="guilabel">Radius</span>: Whirlpool width (0.0-2.0). 
  153.             Determines how much of the image is affected by the
  154.             distortion.  If you set <i class="parameter"><tt>Radius</tt></i> to
  155.             2, the entire image will be affected. If you set
  156.             <i class="parameter"><tt>Radius</tt></i> to 1, half the image will 
  157.             be affected. If <i class="parameter"><tt>Radius</tt></i> is set to 0,
  158.             nothing will be 
  159.             affected (think of it as the radius in a circle with 0 in
  160.             the center and 1 halfway out).  
  161.           </p>
  162.       </div>
  163.     </div>
  164.     <div class="navfooter">
  165.       <hr />
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  169.           <td width="20%" align="center">
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  172.           <td width="40%" align="right">┬á<a accesskey="n" href="ch06s10s16.html">Next</a></td>
  173.         </tr>
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  176.           <td width="20%" align="center">
  177.             <a accesskey="h" href="index.html">Home</a>
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  179.           <td width="40%" align="right" valign="top">┬á10.16.┬áWind</td>
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  183.   </body>
  184. </html>
  185.