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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>
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  6.     <title>5.3.¬† Despeckle</title>
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  12.     <link rel="start" href="index.html" title="GNU Image Manipulation Program" />
  13.     <link rel="up" href="filters-enhance.html" title="5.¬† Enhance Filters" />
  14.     <link rel="prev" href="plug-in-deinterlace.html" title="5.2.¬† Deinterlace" />
  15.     <link rel="next" href="plug-in-nlfilt.html" title="5.4.¬† NL Filter" />
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  17.   <body>
  18.     <div class="navheader">
  19.       <table width="100%" summary="Navigation header">
  20.         <tr>
  21.           <th colspan="3" align="center">5.3.¬†
  22.     <span lang="en" xml:lang="en">Despeckle</span>
  23.   </th>
  24.         </tr>
  25.         <tr>
  26.           <td width="20%" align="left"><a accesskey="p" href="plug-in-deinterlace.html"><img src="../images/prev.png" alt="Prev" /></a>¬†</td>
  27.           <th width="60%" align="center">5.¬†
  28.     <span lang="en" xml:lang="en">Enhance Filters</span>
  29.   </th>
  30.           <td width="20%" align="right">¬†<a accesskey="n" href="plug-in-nlfilt.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-despeckle"></a>5.3.¬†
  40.     <span lang="en" xml:lang="en">Despeckle</span>
  41.   </h3>
  42.           </div>
  43.           <div>
  44.             <div class="revhistory">
  45.               <table border="1" width="100%" summary="Revision history">
  46.                 <tr>
  47.                   <th align="left" valign="top" colspan="3">
  48.                     <b>Revision History</b>
  49.                   </th>
  50.                 </tr>
  51.                 <tr>
  52.                   <td align="left">Revision $Revision: 2055 $</td>
  53.                   <td align="left">2006-11-24</td>
  54.                   <td align="left">j.h</td>
  55.                 </tr>
  56.               </table>
  57.             </div>
  58.           </div>
  59.         </div>
  60.       </div>
  61.       <a id="id2737471" class="indexterm"></a>
  62.       <a id="id2737489" class="indexterm"></a>
  63.       <div class="mediaobject">
  64.         <img src="../images/filters/options-enhance-despeckle.png" />
  65.       </div>
  66.       <div class="sect3" lang="en" xml:lang="en">
  67.         <div class="titlepage">
  68.           <div>
  69.             <div>
  70.               <h4 class="title"><a id="id2737514"></a>5.3.1.¬†
  71.       <span lang="en" xml:lang="en">Overview</span>
  72.     </h4>
  73.             </div>
  74.           </div>
  75.         </div>
  76.         <p>
  77.       You can find this filter through
  78.       <span class="guimenu">Filters</span> ‚Üí <span class="guisubmenu">Enhance</span> ‚Üí <span class="guimenuitem">Despeckle</span>.
  79.     </p>
  80.         <p>
  81.       It is used to remove small defects due to dust, or scratches, on a
  82.       scanned image, and also moir√© effect on image scanned from a magazine.
  83.       You ought to select isolated defects before applying this filter, in
  84.       order to avoid unwanted changes in other areas of your image.
  85.     </p>
  86.       </div>
  87.       <div class="sect3" lang="en" xml:lang="en">
  88.         <div class="titlepage">
  89.           <div>
  90.             <div>
  91.               <h4 class="title"><a id="id2737570"></a>5.3.2.¬†
  92.       <span lang="en" xml:lang="en">Options</span>
  93.     </h4>
  94.             </div>
  95.           </div>
  96.         </div>
  97.         <div class="figure">
  98.           <a id="id2737583"></a>
  99.           <p class="title">
  100.             <b>Figure¬†16.45.¬†
  101.         <span lang="en" xml:lang="en">
  102.           ‚Äú<span class="quote">Despeckle</span>‚Äù filter options
  103.         </span>
  104.       </b>
  105.           </p>
  106.           <div class="figure-contents">
  107.             <div class="mediaobject">
  108.               <img src="../images/filters/options-enhance-despeckle.png" alt="Despeckle filter options" />
  109.             </div>
  110.           </div>
  111.         </div>
  112.         <br class="figure-break" />
  113.         <div class="variablelist">
  114.           <dl>
  115.             <dt>
  116.               <span class="term">Preview</span>
  117.             </dt>
  118.             <dd>
  119.               <p>
  120.             Parameter setting results are interactively displayed in preview.
  121.           </p>
  122.             </dd>
  123.             <dt>
  124.               <span class="term">Type</span>
  125.             </dt>
  126.             <dd>
  127.               <div class="itemizedlist">
  128.                 <ul type="disc">
  129.                   <li>
  130.                     <p>
  131.                 <span class="guilabel">Adaptive</span>: Adapts radius to image or
  132.                 selection content (using Histogram). If this option is
  133.                 checked, radius slider is not efficient.
  134.                 It renders a result smoother than with radius alone.
  135.               </p>
  136.                   </li>
  137.                   <li>
  138.                     <p>
  139.                 <span class="guilabel">Recursive</span>: Repeats filter action
  140.                 which gets stronger.
  141.               </p>
  142.                   </li>
  143.                 </ul>
  144.               </div>
  145.             </dd>
  146.             <dt>
  147.               <span class="term">Parameters settings</span>
  148.             </dt>
  149.             <dd>
  150.               <div class="itemizedlist">
  151.                 <ul type="disc">
  152.                   <li>
  153.                     <p>
  154.                 <span class="guilabel">Radius</span>: Sets size of action window
  155.                 from 1 (3x3 pixels) to 20 (41x41). This window moves over
  156.                 the image, and the color in it is smoothed, so
  157.                 imperfections are removed.
  158.               </p>
  159.                   </li>
  160.                   <li>
  161.                     <p>
  162.                 <span class="guilabel">Black level</span>: Removes pixels darker
  163.                 than set value (0-255).
  164.               </p>
  165.                   </li>
  166.                   <li>
  167.                     <p>
  168.                 <span class="guilabel">White level</span>: Removes pixels whiter
  169.                 than set value (0-255).
  170.               </p>
  171.                   </li>
  172.                 </ul>
  173.               </div>
  174.             </dd>
  175.           </dl>
  176.         </div>
  177.       </div>
  178.     </div>
  179.     <div class="navfooter">
  180.       <hr />
  181.       <table width="100%" summary="Navigation footer">
  182.         <tr>
  183.           <td width="40%" align="left"><a accesskey="p" href="plug-in-deinterlace.html"><img src="../images/prev.png" alt="Prev" /></a>¬†</td>
  184.           <td width="20%" align="center">
  185.             <a accesskey="u" href="filters-enhance.html">
  186.               <img src="../images/up.png" alt="Up" />
  187.             </a>
  188.           </td>
  189.           <td width="40%" align="right">¬†<a accesskey="n" href="plug-in-nlfilt.html"><img src="../images/next.png" alt="Next" /></a></td>
  190.         </tr>
  191.         <tr>
  192.           <td width="40%" align="left" valign="top"><a accesskey="p" href="plug-in-deinterlace.html">5.2.¬†
  193.     <span lang="en" xml:lang="en">Deinterlace</span>
  194.   </a>¬†</td>
  195.           <td width="20%" align="center">
  196.             <a accesskey="h" href="index.html">
  197.               <img src="../images/home.png" alt="Home" />
  198.             </a>
  199.           </td>
  200.           <td width="40%" align="right" valign="top">¬†<a accesskey="n" href="plug-in-nlfilt.html">5.4.¬†
  201.     <span lang="en" xml:lang="en">NL Filter</span>
  202.   </a></td>
  203.         </tr>
  204.       </table>
  205.     </div>
  206.   </body>
  207. </html>
  208.