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  4.   <head>
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  6.     <title>10.35.¬† Threshold Alpha</title>
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  18.     <div class="navheader">
  19.       <table width="100%" summary="Navigation header">
  20.         <tr>
  21.           <th colspan="3" align="center">10.35.¬†
  22.     <span lang="en" xml:lang="en">Threshold Alpha</span>
  23.   </th>
  24.         </tr>
  25.         <tr>
  26.           <td width="20%" align="left"><a accesskey="p" href="gimp-layer-alpha-semi-flatten.html"><img src="../images/prev.png" alt="Prev" /></a>¬†</td>
  27.           <th width="60%" align="center">10.¬†
  28.     <span lang="en" xml:lang="en">The ‚Äú<span class="quote">Layers</span>‚Äù Menu</span>
  29.   </th>
  30.           <td width="20%" align="right">¬†<a accesskey="n" href="gimp-layer-alpha-selection-replace.html"><img src="../images/next.png" alt="Next" /></a></td>
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  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-threshold-alpha"></a>10.35.¬†
  40.     <span lang="en" xml:lang="en">Threshold Alpha</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: 2275 $</td>
  53.                   <td align="left">2006-09-01</td>
  54.                   <td align="left">scb</td>
  55.                 </tr>
  56.               </table>
  57.             </div>
  58.           </div>
  59.         </div>
  60.       </div>
  61.       <a id="id2711681" class="indexterm"></a>
  62.       <a id="id2711698" class="indexterm"></a>
  63.       <p>
  64.     The <span class="guimenuitem">Threshold Alpha</span> command converts
  65.     semi-transparent areas of the active layer into completely transparent or
  66.     completely opaque areas, based on a threshold you set, between 0 and
  67.     255. It only works on layers of RGB images which have an alpha
  68.     channel. If the image is Grayscale or Indexed, or if the layer does not
  69.     have an alpha channel, the menu entry is insensitive and grayed out.
  70.     If the <span class="guilabel">Keep transparency</span> option is checked in the
  71.     Layers dialog, the command displays an error message.
  72.   </p>
  73.       <div class="sect3" lang="en" xml:lang="en">
  74.         <div class="titlepage">
  75.           <div>
  76.             <div>
  77.               <h4 class="title"><a id="id2711733"></a>10.35.1.¬†
  78.       <span lang="en" xml:lang="en">Activating the Command</span>
  79.     </h4>
  80.             </div>
  81.           </div>
  82.         </div>
  83.         <div class="itemizedlist">
  84.           <ul type="disc">
  85.             <li>
  86.               <p>
  87.           You can access this command from the image menubar through
  88.           <span class="guimenu"><span class="accel">L</span>ayer</span> ‚Üí <span class="guisubmenu">Tr<span class="accel">a</span>nsparency</span> ‚Üí <span class="guimenuitem"><span class="accel">T</span>hreshold Alpha</span>.
  89.         </p>
  90.             </li>
  91.           </ul>
  92.         </div>
  93.       </div>
  94.       <div class="sect3" lang="en" xml:lang="en">
  95.         <div class="titlepage">
  96.           <div>
  97.             <div>
  98.               <h4 class="title"><a id="id2711788"></a>10.35.2.¬†
  99.       <span lang="en" xml:lang="en">Description of the Dialog Window</span>
  100.     </h4>
  101.             </div>
  102.           </div>
  103.         </div>
  104.         <div class="figure">
  105.           <a id="id2711800"></a>
  106.           <p class="title">
  107.             <b>Figure¬†15.119.¬†
  108.         <span lang="en" xml:lang="en">The ‚Äú<span class="quote">Threshold Alpha</span>‚Äù dialog</span>
  109.       </b>
  110.           </p>
  111.           <div class="figure-contents">
  112.             <div class="mediaobject">
  113.               <img src="../images/menus/dialogs-threshold-alpha.png" alt="The Threshold Alpha dialog" />
  114.             </div>
  115.           </div>
  116.         </div>
  117.         <br class="figure-break" />
  118.         <div class="variablelist">
  119.           <dl>
  120.             <dt>
  121.               <span class="term">Threshold</span>
  122.             </dt>
  123.             <dd>
  124.               <p>
  125.             You can set the transparency value to be used as a threshold by
  126.             using the slider or by entering a value between 0 and 255 in
  127.             the input box. All transparency values below this threshold will
  128.             become opaque and all transparency values above it will become
  129.             completely transparent. 
  130.           </p>
  131.             </dd>
  132.           </dl>
  133.         </div>
  134.       </div>
  135.     </div>
  136.     <div class="navfooter">
  137.       <hr />
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  140.           <td width="40%" align="left"><a accesskey="p" href="gimp-layer-alpha-semi-flatten.html"><img src="../images/prev.png" alt="Prev" /></a>¬†</td>
  141.           <td width="20%" align="center">
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  143.               <img src="../images/up.png" alt="Up" />
  144.             </a>
  145.           </td>
  146.           <td width="40%" align="right">¬†<a accesskey="n" href="gimp-layer-alpha-selection-replace.html"><img src="../images/next.png" alt="Next" /></a></td>
  147.         </tr>
  148.         <tr>
  149.           <td width="40%" align="left" valign="top"><a accesskey="p" href="gimp-layer-alpha-semi-flatten.html">10.34.¬†
  150.     <span lang="en" xml:lang="en">Semi-flatten</span>
  151.   </a>¬†</td>
  152.           <td width="20%" align="center">
  153.             <a accesskey="h" href="index.html">
  154.               <img src="../images/home.png" alt="Home" />
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  156.           </td>
  157.           <td width="40%" align="right" valign="top">¬†<a accesskey="n" href="gimp-layer-alpha-selection-replace.html">10.36.¬†
  158.     <span lang="en" xml:lang="en">Alpha to Selection</span>
  159.   </a></td>
  160.         </tr>
  161.       </table>
  162.     </div>
  163.   </body>
  164. </html>
  165.