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  4.   <head>
  5.     <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
  6.     <title>8.┬áUndo History dialog</title>
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  11.     <link rel="up" href="ch04.html" title="Chapter┬á4.┬áDialogs" />
  12.     <link rel="prev" href="ch04s07.html" title="7.┬áNavigation Dialog" />
  13.     <link rel="next" href="ch04s09.html" title="9.┬áColors dialog" />
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  17.       <table width="100%" summary="Navigation header">
  18.         <tr>
  19.           <th colspan="3" align="center" id="chaptername">Chapter┬á4.┬áDialogs</th>
  20.         </tr>
  21.         <tr>
  22.           <td width="20%" align="left"><a accesskey="p" href="ch04s07.html">Prev</a>┬á</td>
  23.           <th width="60%" align="center" id="sectionname">8.┬áUndo History dialog</th>
  24.           <td width="20%" align="right">┬á<a accesskey="n" href="ch04s09.html">Next</a></td>
  25.         </tr>
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  27.       <hr />
  28.     </div>
  29.     <div class="sect1" lang="en" xml:lang="en">
  30.       <div class="titlepage">
  31.         <div>
  32.           <div>
  33.             <h2 class="title" style="clear: both"><a id="gimp-undo-dialog"></a>8.┬áUndo History dialog</h2>
  34.           </div>
  35.         </div>
  36.       </div>
  37.       <a id="id3452436" class="indexterm"></a>
  38.       <div class="informalfigure">
  39.         <div class="mediaobject">
  40.           <img src="../images/dialogs/dialogs-undo-history.png" />
  41.           <div class="caption">
  42.             <p>
  43.       The Undo History dialog
  44.     </p>
  45.           </div>
  46.         </div>
  47.       </div>
  48.       <p>
  49.     This dialog shows you a list of the actions you have most
  50.     recently performed on an image, with a small sketch that attempts
  51.     to illustrate the changes produced by each.  You can revert the
  52.     image to any point in its Undo History simply by clicking on the
  53.     right entry in the list.  For more information on GIMP's Undo
  54.     mechanism and how it works, see the section on <a href="ch02s04s05.html" title="4.5.┬áUndoing">Undoing</a>. 
  55.   </p>
  56.       <p>
  57.     The Undo History dialog is a dockable dialog; see the section on
  58.     <a href="ch02s03s04.html" title="3.4.┬áDialogs and Docking">Dialogs and Docking</a> for help on
  59.     manipulating it.  It can be activated in several ways:
  60.   </p>
  61.       <div class="itemizedlist">
  62.         <ul type="disc">
  63.           <li>
  64.             <p>    
  65.         From the Toolbox menu:
  66.         <span class="guimenu">File</span>-><span class="guisubmenu">Dialogs</span>-><span class="guimenuitem"><span class="accel">U</span>ndo History</span>.
  67.       </p>
  68.           </li>
  69.           <li>
  70.             <p>    
  71.         From the Toolbox menu:
  72.         <span class="guimenu">File</span>-><span class="guisubmenu">Dialogs</span>-><span class="guisubmenu">Create New Dock</span>-><span class="guimenuitem">Layers, Channels, and Paths</span>.
  73.         This gives you a dock containing four dialogs, with the
  74.         Undo History dialog one of them.
  75.       </p>
  76.           </li>
  77.           <li>
  78.             <p>    
  79.         From an image menu:
  80.         <span class="guimenu">Edit</span>-><span class="guimenuitem"><span class="accel">U</span>ndo History</span>.
  81.       </p>
  82.           </li>
  83.           <li>
  84.             <p>    
  85.         From an image menu:
  86.         <span class="guimenu">Dialogs</span>-><span class="guimenuitem"><span class="accel">U</span>ndo History</span>.
  87.       </p>
  88.           </li>
  89.           <li>
  90.             <p>    
  91.         From the Tab menu in any dockable dialog:
  92.         <span class="guimenu">Add Tab</span>-><span class="guimenuitem"><span class="accel">U</span>ndo History</span>.
  93.       </p>
  94.           </li>
  95.         </ul>
  96.       </div>
  97.       <div class="simplesect" lang="en" xml:lang="en">
  98.         <div class="titlepage">
  99.           <div>
  100.             <div>
  101.               <h3 class="title"><a id="id3452646"></a>Using the Undo History dialog</h3>
  102.             </div>
  103.           </div>
  104.         </div>
  105.         <p>
  106.       The most basic thing you can do is to select a point in the Undo
  107.       History by clicking on it in the list.  You can go back and
  108.       forth between states in this way as much as you please, without
  109.       losing any information or consuming any resources.  In most
  110.       cases, the changes are very fast.
  111.     </p>
  112.         <p>
  113.       At the bottom of the dialog are three buttons:
  114.     </p>
  115.         <div class="itemizedlist">
  116.           <ul type="disc">
  117.             <li>
  118.               <p><b>Undo.┬á</b>
  119.         This button has the same effect as choosing 
  120.         <span class="guimenu">Edit</span>-><span class="guimenuitem">Undo</span>
  121.         from the menu, or pressing
  122.         <span><b class="keycap">Ctrl</b></span>-<span><b class="keycap">Z</b></span>;
  123.         it reverts the image to the next state back in the undo
  124.         history.
  125.       </p>
  126.             </li>
  127.             <li>
  128.               <p><b>Redo.┬á</b>
  129.         This button has the same effect as choosing 
  130.         <span class="guimenu">Edit</span>-><span class="guimenuitem">Redo</span>
  131.         from the menu, or pressing
  132.         <span><b class="keycap">Ctrl</b></span>-<span><b class="keycap">Y</b></span>;
  133.         it advances the image to the next state forward in the undo
  134.         history.
  135.       </p>
  136.             </li>
  137.             <li>
  138.               <p><b>Clear Undo History.┬á</b>
  139.         This button removes all contents from the undo history except
  140.         the current state.  If you press it, you are asked to confirm
  141.         that you really want to do this.  The only reason for doing it
  142.         would be if you are very constrained for memory.
  143.       </p>
  144.             </li>
  145.           </ul>
  146.         </div>
  147.       </div>
  148.     </div>
  149.     <div class="navfooter">
  150.       <hr />
  151.       <table width="100%" summary="Navigation footer">
  152.         <tr>
  153.           <td width="40%" align="left"><a accesskey="p" href="ch04s07.html">Prev</a>┬á</td>
  154.           <td width="20%" align="center">
  155.             <a accesskey="u" href="ch04.html">Up</a>
  156.           </td>
  157.           <td width="40%" align="right">┬á<a accesskey="n" href="ch04s09.html">Next</a></td>
  158.         </tr>
  159.         <tr>
  160.           <td width="40%" align="left" valign="top">7.┬áNavigation Dialog┬á</td>
  161.           <td width="20%" align="center">
  162.             <a accesskey="h" href="index.html">Home</a>
  163.           </td>
  164.           <td width="40%" align="right" valign="top">┬á9.┬áColors dialog</td>
  165.         </tr>
  166.       </table>
  167.     </div>
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  170.