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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">
  3. <html xmlns="http://www.w3.org/1999/xhtml">
  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" />
  8.     <link rel="stylesheet" href="gimp-help-screen.css" type="text/css" />
  9.     <meta name="generator" content="DocBook XSL Stylesheets V1.64.1" />
  10.     <link rel="home" href="index.html" title="GIMP User Manual" />
  11.     <link rel="up" href="ch05s06.html" title="6.┬áEnhance filters" />
  12.     <link rel="previous" href="ch05s06s05.html" title="6.5.┬áNL Filter" />
  13.     <link rel="next" href="ch05s06s07.html" title="6.7.┬áUnsharp Mask" />
  14.   </head>
  15.   <body>
  16.     <div class="navheader">
  17.       <table width="100%" summary="Navigation header">
  18.         <tr>
  19.           <th colspan="3" align="center">6.6.┬áSharpen</th>
  20.         </tr>
  21.         <tr>
  22.           <td width="20%" align="left"><a accesskey="p" href="ch05s06s05.html">Prev</a>┬á</td>
  23.           <th width="60%" align="center">6.┬áEnhance filters</th>
  24.           <td width="20%" align="right">┬á<a accesskey="n" href="ch05s06s07.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></div>
  37.       </div>
  38.       <a id="id2975749" class="indexterm"></a>
  39.       <div class="mediaobject">
  40.         <img src="../images/filters/filters-enhance-sharpen.png" />
  41.       </div>
  42.       <div class="simplesect" lang="en" xml:lang="en">
  43.         <div class="titlepage">
  44.           <div>
  45.             <div>
  46.               <h4 class="title"><a id="id2975770"></a>Overview</h4>
  47.             </div>
  48.           </div>
  49.           <div></div>
  50.         </div>
  51.         <p>
  52.       This filter is found in 
  53.       <span class="guimenuitem">Image>Filters/Enhance/<span class="accel">S</span>harpen</span>
  54.     </p>
  55.         <p>
  56.       Most of digitized images need correction of sharpness. This is due to digitizing process 
  57.       that must chop a color continuum up in points with slightly different colors: elements 
  58.       thiner than sampling frequency will be averaged into an uniform color. So sharp borders 
  59.       are rendered a little blurred. The same phenomenon appears when printing color dots on 
  60.       paper.
  61.     </p>
  62.         <p>
  63.       The Sharpen filter accentuates edges but also any noise or blemish and it may create noise 
  64.       in graduated color areas like the sky or a water surface. It competes with the 
  65.       Unsharp Mask filter, which is more sophisticated and renders more natural results.
  66.     </p>
  67.       </div>
  68.       <div class="simplesect" lang="en" xml:lang="en">
  69.         <div class="titlepage">
  70.           <div>
  71.             <div>
  72.               <h4 class="title"><a id="id2975815"></a>Options</h4>
  73.             </div>
  74.           </div>
  75.           <div></div>
  76.         </div>
  77.         <div class="variablelist">
  78.           <dl>
  79.             <dt>
  80.               <span class="term">Preview</span>
  81.             </dt>
  82.             <dd>
  83.               <p>
  84.             Parameter setting results are interactively displayed in preview. Scroll bars allow you to 
  85.             move around the image.
  86.           </p>
  87.             </dd>
  88.             <dt>
  89.               <span class="term">Parameter setting</span>
  90.             </dt>
  91.             <dd>
  92.               <p>
  93.             <span class="guilabel">Increase sharpness</span>: slider and input boxes allow you to set 
  94.             sharpness (1-99) and you can judge result in preview. By increasing sharpness, you may 
  95.             increase image blemishes and also create noise in graduated color areas.
  96.           </p>
  97.             </dd>
  98.           </dl>
  99.         </div>
  100.       </div>
  101.     </div>
  102.     <div class="navfooter">
  103.       <hr />
  104.       <table width="100%" summary="Navigation footer">
  105.         <tr>
  106.           <td width="40%" align="left"><a accesskey="p" href="ch05s06s05.html">Prev</a>┬á</td>
  107.           <td width="20%" align="center">
  108.             <a accesskey="u" href="ch05s06.html">Up</a>
  109.           </td>
  110.           <td width="40%" align="right">┬á<a accesskey="n" href="ch05s06s07.html">Next</a></td>
  111.         </tr>
  112.         <tr>
  113.           <td width="40%" align="left" valign="top">6.5.┬áNL Filter┬á</td>
  114.           <td width="20%" align="center">
  115.             <a accesskey="h" href="index.html">Home</a>
  116.           </td>
  117.           <td width="40%" align="right" valign="top">┬á6.7.┬áUnsharp Mask</td>
  118.         </tr>
  119.       </table>
  120.     </div>
  121.   </body>
  122. </html>
  123.