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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>
  5.     <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
  6.     <title>5.5.┬áThreshold Tool</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="ch03s05.html" title="5.┬áColor Tools" />
  12.     <link rel="prev" href="ch03s05s04.html" title="5.4.┬áBrightness-Contrast tool" />
  13.     <link rel="next" href="ch03s05s06.html" title="5.6.┬áLevels tool" />
  14.   </head>
  15.   <body>
  16.     <div xmlns="" class="navheader">
  17.       <table width="100%" summary="Navigation header">
  18.         <tr>
  19.           <th colspan="3" align="center" id="chaptername">5.┬áColor Tools</th>
  20.         </tr>
  21.         <tr>
  22.           <td width="20%" align="left"><a accesskey="p" href="ch03s05s04.html">Prev</a>┬á</td>
  23.           <th width="60%" align="center" id="sectionname">5.5.┬áThreshold Tool</th>
  24.           <td width="20%" align="right">┬á<a accesskey="n" href="ch03s05s06.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="gimp-tool-threshold"></a>5.5.┬áThreshold Tool</h3>
  34.           </div>
  35.         </div>
  36.       </div>
  37.       <div class="mediaobject">
  38.         <img src="../images/toolbox/tools-threshold.png" />
  39.       </div>
  40.       <p>
  41.     With the Treshold tool you can make visible or invisible the pixels of the
  42.     active layer or selection by their intensity values. 
  43.   </p>
  44.       <div class="simplesect" lang="en" xml:lang="en">
  45.         <div class="titlepage">
  46.           <div>
  47.             <div>
  48.               <h4 class="title"><a id="id3443588"></a>Activate Tool</h4>
  49.             </div>
  50.           </div>
  51.         </div>
  52.         <p>
  53.       The Threshold Tool can be called in the following
  54.       order, from the image-menu:
  55.       <span class="guimenuitem"><span class="accel">T</span>ools</span>/
  56.       <span class="guimenuitem"><span class="accel">C</span>olor
  57.         Tools</span>/<span class="guimenuitem"><span class="accel">T</span>hreshold
  58.         .</span> 
  59.     </p>
  60.       </div>
  61.       <div class="simplesect" lang="en" xml:lang="en">
  62.         <div class="titlepage">
  63.           <div>
  64.             <div>
  65.               <h4 class="title"><a id="id3443629"></a>Options</h4>
  66.             </div>
  67.           </div>
  68.         </div>
  69.         <div class="variablelist">
  70.           <dl>
  71.             <dt>
  72.               <span class="term">Threshold range</span>
  73.             </dt>
  74.             <dd>
  75.               <p>
  76.           The Threshold tool provides a visual graph of the intensity value
  77.           of the active layer or selection. You can set the threshold range
  78.           either using the input boxes or clicking button 1 and dragging on
  79.           the graph.  It allows you to select a part of the image with some
  80.           intensity from a background with another intensity. Pixels inside
  81.           the range will be white, and the others will be black. 
  82.           Adjust the range to get the selection you want in white
  83.           on black background. This method of extracting a selection is well
  84.           explained in Grokking the Gimp.
  85.         </p>
  86.             </dd>
  87.             <dt>
  88.               <span class="term">Preview</span>
  89.             </dt>
  90.             <dd>
  91.               <p>
  92.           The Preview toggle allows dynamic updating of the active layer or
  93.           selection while changes are made to the intensity level.
  94.         </p>
  95.             </dd>
  96.           </dl>
  97.         </div>
  98.       </div>
  99.     </div>
  100.     <div class="navfooter">
  101.       <hr />
  102.       <table width="100%" summary="Navigation footer">
  103.         <tr>
  104.           <td width="40%" align="left"><a accesskey="p" href="ch03s05s04.html">Prev</a>┬á</td>
  105.           <td width="20%" align="center">
  106.             <a accesskey="u" href="ch03s05.html">Up</a>
  107.           </td>
  108.           <td width="40%" align="right">┬á<a accesskey="n" href="ch03s05s06.html">Next</a></td>
  109.         </tr>
  110.         <tr>
  111.           <td width="40%" align="left" valign="top">5.4.┬áBrightness-Contrast tool┬á</td>
  112.           <td width="20%" align="center">
  113.             <a accesskey="h" href="index.html">Home</a>
  114.           </td>
  115.           <td width="40%" align="right" valign="top">┬á5.6.┬áLevels tool</td>
  116.         </tr>
  117.       </table>
  118.     </div>
  119.   </body>
  120. </html>
  121.