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  6.     <title>5.8.¬† Sharpen</title>
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  14.     <link rel="prev" href="plug-in-unsharp-mask.html" title="5.7.¬† Unsharp Mask" />
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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">5.8.¬†
  22.     <span lang="en" xml:lang="en">Sharpen</span>
  23.   </th>
  24.         </tr>
  25.         <tr>
  26.           <td width="20%" align="left"><a accesskey="p" href="plug-in-unsharp-mask.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="filters-generic.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-sharpen"></a>5.8.¬†
  40.     <span lang="en" xml:lang="en">Sharpen</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">2006-11-26</td>
  54.                   <td align="left">j.h</td>
  55.                 </tr>
  56.               </table>
  57.             </div>
  58.           </div>
  59.         </div>
  60.       </div>
  61.       <a id="id2739687" class="indexterm"></a>
  62.       <a id="id2739705" class="indexterm"></a>
  63.       <div class="sect3" lang="en" xml:lang="en">
  64.         <div class="titlepage">
  65.           <div>
  66.             <div>
  67.               <h4 class="title"><a id="id2739714"></a>5.8.1.¬†
  68.       <span lang="en" xml:lang="en">Overview</span>
  69.     </h4>
  70.             </div>
  71.           </div>
  72.         </div>
  73.         <p>
  74.       You can find this filter through
  75.       <span class="guimenu">Filters</span> ‚Üí <span class="guisubmenu">Enhance</span> ‚Üí <span class="guimenuitem">Sharpen</span>.
  76.     </p>
  77.         <p>
  78.       Most of digitized images need correction of sharpness. This is due to
  79.       digitizing process that must chop a color continuum up in points with
  80.       slightly different colors: elements thiner than sampling frequency
  81.       will be averaged into an uniform color. So sharp borders are rendered
  82.       a little blurred. The same phenomenon appears when printing color dots
  83.       on paper.
  84.     </p>
  85.         <p>
  86.       The Sharpen filter accentuates edges but also any noise or blemish and
  87.       it may create noise in graduated color areas like the sky or a water
  88.       surface. It competes with the Unsharp Mask filter, which is more
  89.       sophisticated and renders more natural results.
  90.     </p>
  91.         <div class="figure">
  92.           <a id="id2739776"></a>
  93.           <p class="title">
  94.             <b>Figure¬†16.53.¬†
  95.         <span lang="en" xml:lang="en">
  96.           Applying example for the Sharpen filter
  97.         </span>
  98.       </b>
  99.           </p>
  100.           <div class="figure-contents">
  101.             <div class="mediaobject">
  102.               <img src="../images/filters/examples/taj_orig.jpg" alt="Applying example for the Sharpen filter" />
  103.             </div>
  104.             <div class="mediaobject">
  105.               <img src="../images/filters/examples/enhance-taj-sharpen.jpg" alt="Applying example for the Sharpen filter" />
  106.             </div>
  107.           </div>
  108.         </div>
  109.         <br class="figure-break" />
  110.       </div>
  111.       <div class="sect3" lang="en" xml:lang="en">
  112.         <div class="titlepage">
  113.           <div>
  114.             <div>
  115.               <h4 class="title"><a id="id2739820"></a>5.8.2.¬†
  116.       <span lang="en" xml:lang="en">Options</span>
  117.     </h4>
  118.             </div>
  119.           </div>
  120.         </div>
  121.         <div class="figure">
  122.           <a id="id2739831"></a>
  123.           <p class="title">
  124.             <b>Figure¬†16.54.¬†
  125.         <span lang="en" xml:lang="en">
  126.           ‚Äú<span class="quote">Sharpen</span>‚Äù filter options
  127.         </span>
  128.       </b>
  129.           </p>
  130.           <div class="figure-contents">
  131.             <div class="mediaobject">
  132.               <img src="../images/filters/filters-enhance-sharpen.png" alt="Sharpen filter options" />
  133.             </div>
  134.           </div>
  135.         </div>
  136.         <br class="figure-break" />
  137.         <div class="variablelist">
  138.           <dl>
  139.             <dt>
  140.               <span class="term">Preview</span>
  141.             </dt>
  142.             <dd>
  143.               <p>
  144.             Parameter setting results are interactively displayed in preview.
  145.             Scroll bars allow you to move around the image.
  146.           </p>
  147.             </dd>
  148.             <dt>
  149.               <span class="term">Parameter setting</span>
  150.             </dt>
  151.             <dd>
  152.               <p>
  153.             <span class="guilabel">Increase sharpness</span>: slider and input boxes
  154.             allow you to set sharpness (1-99) and you can judge result in
  155.             preview. By increasing sharpness, you may increase image
  156.             blemishes and also create noise in graduated color areas.
  157.           </p>
  158.             </dd>
  159.           </dl>
  160.         </div>
  161.       </div>
  162.     </div>
  163.     <div class="navfooter">
  164.       <hr />
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  166.         <tr>
  167.           <td width="40%" align="left"><a accesskey="p" href="plug-in-unsharp-mask.html"><img src="../images/prev.png" alt="Prev" /></a>¬†</td>
  168.           <td width="20%" align="center">
  169.             <a accesskey="u" href="filters-enhance.html">
  170.               <img src="../images/up.png" alt="Up" />
  171.             </a>
  172.           </td>
  173.           <td width="40%" align="right">¬†<a accesskey="n" href="filters-generic.html"><img src="../images/next.png" alt="Next" /></a></td>
  174.         </tr>
  175.         <tr>
  176.           <td width="40%" align="left" valign="top"><a accesskey="p" href="plug-in-unsharp-mask.html">5.7.¬†
  177.     <span lang="en" xml:lang="en">Unsharp Mask</span>
  178.   </a>¬†</td>
  179.           <td width="20%" align="center">
  180.             <a accesskey="h" href="index.html">
  181.               <img src="../images/home.png" alt="Home" />
  182.             </a>
  183.           </td>
  184.           <td width="40%" align="right" valign="top">¬†<a accesskey="n" href="filters-generic.html">6.¬†
  185.     <span lang="en" xml:lang="en">Generic Filters</span>
  186.   </a></td>
  187.         </tr>
  188.       </table>
  189.     </div>
  190.   </body>
  191. </html>
  192.