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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>3.14.┬áColor to Alpha</title>
  7.     <link rel="stylesheet" href="gimp-help-plain.css" type="text/css" />
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  10.     <link rel="home" href="index.html" title="GIMP User Manual" />
  11.     <link rel="up" href="ch05s03.html" title="3.┬áColor filters" />
  12.     <link rel="previous" href="ch05s03s13.html" title="3.13.┬áColorify" />
  13.     <link rel="next" href="ch05s03s15.html" title="3.15.┬áCompose" />
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  15.   <body>
  16.     <div class="navheader">
  17.       <table width="100%" summary="Navigation header">
  18.         <tr>
  19.           <th colspan="3" align="center">3.14.┬áColor to Alpha</th>
  20.         </tr>
  21.         <tr>
  22.           <td width="20%" align="left"><a accesskey="p" href="ch05s03s13.html">Prev</a>┬á</td>
  23.           <th width="60%" align="center">3.┬áColor filters</th>
  24.           <td width="20%" align="right">┬á<a accesskey="n" href="ch05s03s15.html">Next</a></td>
  25.         </tr>
  26.       </table>
  27.       <hr />
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  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-colortoalpha"></a>3.14.┬áColor to Alpha</h3>
  34.           </div>
  35.         </div>
  36.         <div></div>
  37.       </div>
  38.       <a id="id2972056" class="indexterm"></a>
  39.       <div class="mediaobject">
  40.         <img src="../images/filters/filters-color-colortoalpha.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="id2972088"></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/Colors/Color to <span class="accel">A</span>lpha</span>
  54.     </p>
  55.         <p>
  56.       The Color to Alpha filter makes transparent all pixels with a selected color. An Alpha channel is 
  57.       created. 
  58.       It will attempt to preserve antialiasing information by using a partially intelligent routine that 
  59.       replaces weak color information with weak alpha information. In this way, areas that contain an 
  60.       element of the selected color will maintain a blended appearence with their surrounding pixels.
  61.     </p>
  62.       </div>
  63.       <div class="simplesect" lang="en" xml:lang="en">
  64.         <div class="titlepage">
  65.           <div>
  66.             <div>
  67.               <h4 class="title"><a id="id2972123"></a>Options</h4>
  68.             </div>
  69.           </div>
  70.           <div></div>
  71.         </div>
  72.         <div class="variablelist">
  73.           <dl>
  74.             <dt>
  75.               <span class="term">Color</span>
  76.             </dt>
  77.             <dd>
  78.               <p>
  79.             Clicking on the <span class="guilabel">From</span> color swatch provides a color selection dialog where 
  80.             you can select a color. If selection of a precise color is required, use the Color Picker then 
  81.             drag and drop the selected color from the color picker to the From color swatch. Right clicking 
  82.             on the color well displays a menu where you can select Foreground or Background colors, or 
  83.             White or Black.
  84.           </p>
  85.             </dd>
  86.           </dl>
  87.         </div>
  88.       </div>
  89.     </div>
  90.     <div class="navfooter">
  91.       <hr />
  92.       <table width="100%" summary="Navigation footer">
  93.         <tr>
  94.           <td width="40%" align="left"><a accesskey="p" href="ch05s03s13.html">Prev</a>┬á</td>
  95.           <td width="20%" align="center">
  96.             <a accesskey="u" href="ch05s03.html">Up</a>
  97.           </td>
  98.           <td width="40%" align="right">┬á<a accesskey="n" href="ch05s03s15.html">Next</a></td>
  99.         </tr>
  100.         <tr>
  101.           <td width="40%" align="left" valign="top">3.13.┬áColorify┬á</td>
  102.           <td width="20%" align="center">
  103.             <a accesskey="h" href="index.html">Home</a>
  104.           </td>
  105.           <td width="40%" align="right" valign="top">┬á3.15.┬áCompose</td>
  106.         </tr>
  107.       </table>
  108.     </div>
  109.   </body>
  110. </html>
  111.