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  6.     <title>8.18.¬† Whirl and Pinch</title>
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  18.     <div class="navheader">
  19.       <table width="100%" summary="Navigation header">
  20.         <tr>
  21.           <th colspan="3" align="center">8.18.¬†
  22.     <span lang="en" xml:lang="en">Whirl and Pinch</span>
  23.   </th>
  24.         </tr>
  25.         <tr>
  26.           <td width="20%" align="left"><a accesskey="p" href="plug-in-newsprint.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="filters-artistic.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-whirl-pinch"></a>8.18.¬†
  40.     <span lang="en" xml:lang="en">Whirl and Pinch</span>
  41.   </h3>
  42.           </div>
  43.         </div>
  44.       </div>
  45.       <a id="id2756274" class="indexterm"></a>
  46.       <a id="id2756292" 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="id2756300"></a>8.18.1.¬†
  52.       <span lang="en" xml:lang="en">Overview</span>
  53.     </h4>
  54.             </div>
  55.           </div>
  56.         </div>
  57.         <div class="figure">
  58.           <a id="id2756311"></a>
  59.           <p class="title">
  60.             <b>Figure¬†16.152.¬†
  61.         <span lang="en" xml:lang="en">Example for the Whirl and Pinch filter</span>
  62.       </b>
  63.           </p>
  64.           <div class="figure-contents">
  65.             <div class="mediaobject">
  66.               <img src="../images/filters/examples/taj_orig.jpg" alt="Example for the Whirl and Pinch filter" />
  67.               <div class="caption">
  68.                 <p>Original image</p>
  69.               </div>
  70.             </div>
  71.             <div class="mediaobject">
  72.               <img src="../images/filters/examples/distort-taj-whirlpinch.jpg" alt="Example for the Whirl and Pinch filter" />
  73.               <div class="caption">
  74.                 <p>Filter applied</p>
  75.               </div>
  76.             </div>
  77.           </div>
  78.         </div>
  79.         <br class="figure-break" />
  80.         <p>
  81.       You can find this filter through
  82.       <span class="guimenu">Filters</span> ‚Üí <span class="guisubmenu">Distorts</span> ‚Üí <span class="guimenuitem">W<span class="accel">h</span>irl and Pinch</span>
  83.     </p>
  84.         <p>
  85.       "Whirl and Pinch" distorts your image in a concentric way.
  86.     </p>
  87.         <p>
  88.       "Whirl" distorts the image much like the little whirlpool that
  89.       appears when you empty your bath.
  90.     </p>
  91.         <p>
  92.       "Pinch" can be compared to applying your image to a soft rubber
  93.       surface and squeezing the edges or corners. If the Pinch amount
  94.       slider is set to a negative value, it will look as if someone
  95.       tried to push a round object up toward you from behind the
  96.       rubber skin. If the Pinch amount is set to a positive value, it
  97.       looks like someone is dragging or sucking on the surface from
  98.       behind, and away from you.
  99.     </p>
  100.         <div class="tip" style="margin-left: 0.5in; margin-right: 0.5in;">
  101.           <table border="0" summary="Tip">
  102.             <tr>
  103.               <td rowspan="2" align="center" valign="top" width="25">
  104.                 <img alt="[Tip]" src="../images/tip.png" />
  105.               </td>
  106.               <th align="left">Tip</th>
  107.             </tr>
  108.             <tr>
  109.               <td align="left" valign="top">
  110.                 <p>
  111.         The ‚Äú<span class="quote">pinch</span>‚Äù effect can sometimes be used to compensate
  112.         for image distortion produced by telephoto or fisheye lenses
  113.         (‚Äú<span class="quote">barrel distortion</span>‚Äù).
  114.       </p>
  115.               </td>
  116.             </tr>
  117.           </table>
  118.         </div>
  119.         <div class="figure">
  120.           <a id="id2756455"></a>
  121.           <p class="title">
  122.             <b>Figure¬†16.153.¬†
  123.         <span lang="en" xml:lang="en">Illustration</span>
  124.       </b>
  125.           </p>
  126.           <div class="figure-contents">
  127.             <div class="mediaobject">
  128.               <img src="../images/filters/examples/whirlpinch-orig.png" alt="Illustration" />
  129.               <div class="caption">
  130.                 <p>Original</p>
  131.               </div>
  132.             </div>
  133.             <div class="mediaobject">
  134.               <img src="../images/filters/examples/whirlpinch-whirl.png" alt="Illustration" />
  135.               <div class="caption">
  136.                 <p>Whirled</p>
  137.                 <p>Remolino</p>
  138.               </div>
  139.             </div>
  140.             <div class="mediaobject">
  141.               <img src="../images/filters/examples/whirlpinch-pinch.png" alt="Illustration" />
  142.               <div class="caption">
  143.                 <p>Pinched</p>
  144.               </div>
  145.             </div>
  146.           </div>
  147.         </div>
  148.         <br class="figure-break" />
  149.       </div>
  150.       <div class="sect3" lang="en" xml:lang="en">
  151.         <div class="titlepage">
  152.           <div>
  153.             <div>
  154.               <h4 class="title"><a id="id2756546"></a>8.18.2.¬†
  155.       <span lang="en" xml:lang="en">Parameter Settings</span>
  156.     </h4>
  157.             </div>
  158.           </div>
  159.         </div>
  160.         <div class="figure">
  161.           <a id="id2756557"></a>
  162.           <p class="title">
  163.             <b>Figure¬†16.154.¬†
  164.         <span lang="en" xml:lang="en">
  165.           ‚Äú<span class="quote">Whirl and Pinch</span>‚Äù filter options
  166.         </span>
  167.       </b>
  168.           </p>
  169.           <div class="figure-contents">
  170.             <div class="mediaobject">
  171.               <img src="../images/filters/filters-distort-whirlpinch.png" alt="Whirl and Pinch filter options" />
  172.             </div>
  173.           </div>
  174.         </div>
  175.         <br class="figure-break" />
  176.         <div class="variablelist">
  177.           <dl>
  178.             <dt>
  179.               <span class="term">Preview</span>
  180.             </dt>
  181.             <dd>
  182.               <p>
  183.             Changes to parameters are immediately displayed into the
  184.             <span class="emphasis"><em>Preview</em></span>. The whirlpool is focused around the
  185.             center of the current layer or selection.
  186.           </p>
  187.             </dd>
  188.             <dt>
  189.               <span class="term">Whirl Angle</span>
  190.             </dt>
  191.             <dd>
  192.               <p>
  193.             <span class="guilabel">Whirl Angle</span>: Clockwise or counter
  194.             clockwise (-360 to +360). Controls how many degrees the
  195.             affected part of the image is rotated.
  196.           </p>
  197.             </dd>
  198.             <dt>
  199.               <span class="term">Pinch Amount</span>
  200.             </dt>
  201.             <dd>
  202.               <p>
  203.             <span class="guilabel">Pinch Amount</span>: Whirlpool depth(-1 to
  204.             +1).  Determines how strongly the affected part of the
  205.             image is pinched.
  206.           </p>
  207.             </dd>
  208.             <dt>
  209.               <span class="term">Radius</span>
  210.             </dt>
  211.             <dd>
  212.               <p>
  213.             <span class="guilabel">Radius</span>: Whirlpool width (0.0-2.0).
  214.             Determines how much of the image is affected by the
  215.             distortion.  If you set <em class="parameter"><code>Radius</code></em> to
  216.             2, the entire image will be affected. If you set
  217.             <em class="parameter"><code>Radius</code></em> to 1, half the image will
  218.             be affected. If <em class="parameter"><code>Radius</code></em> is set to 0,
  219.             nothing will be
  220.             affected (think of it as the radius in a circle with 0 in
  221.             the center and 1 halfway out).
  222.           </p>
  223.             </dd>
  224.           </dl>
  225.         </div>
  226.       </div>
  227.     </div>
  228.     <div class="navfooter">
  229.       <hr />
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  231.         <tr>
  232.           <td width="40%" align="left"><a accesskey="p" href="plug-in-newsprint.html"><img src="../images/prev.png" alt="Prev" /></a>¬†</td>
  233.           <td width="20%" align="center">
  234.             <a accesskey="u" href="filters-distort.html">
  235.               <img src="../images/up.png" alt="Up" />
  236.             </a>
  237.           </td>
  238.           <td width="40%" align="right">¬†<a accesskey="n" href="filters-artistic.html"><img src="../images/next.png" alt="Next" /></a></td>
  239.         </tr>
  240.         <tr>
  241.           <td width="40%" align="left" valign="top"><a accesskey="p" href="plug-in-newsprint.html">8.17.¬†
  242.     <span lang="en" xml:lang="en">Newsprint</span>
  243.   </a>¬†</td>
  244.           <td width="20%" align="center">
  245.             <a accesskey="h" href="index.html">
  246.               <img src="../images/home.png" alt="Home" />
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  248.           </td>
  249.           <td width="40%" align="right" valign="top">¬†<a accesskey="n" href="filters-artistic.html">9.¬†
  250.     <span lang="en" xml:lang="en">Artistic Filters</span>
  251.   </a></td>
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  257.