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  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>6.6.┬áSharpen</title>
  7.     <link rel="stylesheet" href="gimp-help-plain.css" type="text/css" />
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  10.     <link rel="start" href="index.html" title="GIMP User Manual" />
  11.     <link rel="up" href="ch06s06.html" title="6.┬áEnhance filters" />
  12.     <link rel="prev" href="ch06s06s05.html" title="6.5.┬áNL Filter" />
  13.     <link rel="next" href="ch06s06s07.html" title="6.7.┬áUnsharp Mask" />
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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">6.┬áEnhance filters</th>
  20.         </tr>
  21.         <tr>
  22.           <td width="20%" align="left"><a accesskey="p" href="ch06s06s05.html">Prev</a>┬á</td>
  23.           <th width="60%" align="center" id="sectionname">6.6.┬áSharpen</th>
  24.           <td width="20%" align="right">┬á<a accesskey="n" href="ch06s06s07.html">Next</a></td>
  25.         </tr>
  26.       </table>
  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-sharpen"></a>6.6.┬áSharpen</h3>
  34.           </div>
  35.         </div>
  36.       </div>
  37.       <a id="id3479513" class="indexterm"></a>
  38.       <div class="mediaobject">
  39.         <img src="../images/filters/filters-enhance-sharpen.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="id3479535"></a>Overview</h4>
  46.             </div>
  47.           </div>
  48.         </div>
  49.         <p>
  50.       This filter is found in 
  51.       <span class="guimenuitem">Image>Filters/Enhance/<span class="accel">S</span>harpen</span>
  52.     </p>
  53.         <p>
  54.       Most of digitized images need correction of sharpness. This is due to digitizing process 
  55.       that must chop a color continuum up in points with slightly different colors: elements 
  56.       thiner than sampling frequency will be averaged into an uniform color. So sharp borders 
  57.       are rendered a little blurred. The same phenomenon appears when printing color dots on 
  58.       paper.
  59.     </p>
  60.         <p>
  61.       The Sharpen filter accentuates edges but also any noise or blemish and it may create noise 
  62.       in graduated color areas like the sky or a water surface. It competes with the 
  63.       Unsharp Mask filter, which is more sophisticated and renders more natural results.
  64.     </p>
  65.       </div>
  66.       <div class="simplesect" lang="en" xml:lang="en">
  67.         <div class="titlepage">
  68.           <div>
  69.             <div>
  70.               <h4 class="title"><a id="id3479579"></a>Options</h4>
  71.             </div>
  72.           </div>
  73.         </div>
  74.         <div class="variablelist">
  75.           <dl>
  76.             <dt>
  77.               <span class="term">Preview</span>
  78.             </dt>
  79.             <dd>
  80.               <p>
  81.             Parameter setting results are interactively displayed in preview. Scroll bars allow you to 
  82.             move around the image.
  83.           </p>
  84.             </dd>
  85.             <dt>
  86.               <span class="term">Parameter setting</span>
  87.             </dt>
  88.             <dd>
  89.               <p>
  90.             <span class="guilabel">Increase sharpness</span>: slider and input boxes allow you to set 
  91.             sharpness (1-99) and you can judge result in preview. By increasing sharpness, you may 
  92.             increase image blemishes and also create noise in graduated color areas.
  93.           </p>
  94.             </dd>
  95.           </dl>
  96.         </div>
  97.       </div>
  98.     </div>
  99.     <div class="navfooter">
  100.       <hr />
  101.       <table width="100%" summary="Navigation footer">
  102.         <tr>
  103.           <td width="40%" align="left"><a accesskey="p" href="ch06s06s05.html">Prev</a>┬á</td>
  104.           <td width="20%" align="center">
  105.             <a accesskey="u" href="ch06s06.html">Up</a>
  106.           </td>
  107.           <td width="40%" align="right">┬á<a accesskey="n" href="ch06s06s07.html">Next</a></td>
  108.         </tr>
  109.         <tr>
  110.           <td width="40%" align="left" valign="top">6.5.┬áNL Filter┬á</td>
  111.           <td width="20%" align="center">
  112.             <a accesskey="h" href="index.html">Home</a>
  113.           </td>
  114.           <td width="40%" align="right" valign="top">┬á6.7.┬áUnsharp Mask</td>
  115.         </tr>
  116.       </table>
  117.     </div>
  118.   </body>
  119. </html>
  120.