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<h2 class="title" style="clear: both"><a id="gimp-undo-dialog"></a>8. Undo History dialog</h2>
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<a id="id3335627" class="indexterm"></a>
<div class="informalfigure">
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<img src="../images/dialogs/dialogs-undo-history.png" />
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<p>
The Undo History dialog
</p>
</div>
</div>
</div>
<p>
This dialog shows you a list of the actions you have most
recently performed on an image, with a small sketch that attempts
to illustrate the changes produced by each. You can revert the
image to any point in its Undo History simply by clicking on the
right entry in the list. For more information on GIMP's Undo
mechanism and how it works, see the section on <a href="ch02s04s05.html" title="4.5. Undoing">Undoing</a>.
</p>
<p>
The Undo History dialog is a dockable dialog; see the section on
<a href="ch02s03s04.html" title="3.4. Dialogs and Docking">Dialogs and Docking</a> for help on
manipulating it. It can be activated in several ways:
</p>
<div class="itemizedlist">
<ul type="disc">
<li>
<p>
From the Toolbox menu:
<span class="guimenu">File</span>-><span class="guisubmenu">Dialogs</span>-><span class="guimenuitem"><span class="accel">U</span>ndo History</span>.
</p>
</li>
<li>
<p>
From the Toolbox menu:
<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>.
This gives you a dock containing four dialogs, with the
Undo History dialog one of them.
</p>
</li>
<li>
<p>
From an image menu:
<span class="guimenu">Edit</span>-><span class="guimenuitem"><span class="accel">U</span>ndo History</span>.
</p>
</li>
<li>
<p>
From an image menu:
<span class="guimenu">Dialogs</span>-><span class="guimenuitem"><span class="accel">U</span>ndo History</span>.
</p>
</li>
<li>
<p>
From the Tab menu in any dockable dialog:
<span class="guimenu">Add Tab</span>-><span class="guimenuitem"><span class="accel">U</span>ndo History</span>.
</p>
</li>
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<h3 class="title"><a id="id3338519"></a>Using the Undo History dialog</h3>
</div>
</div>
</div>
<p>
The most basic thing you can do is to select a point in the Undo
History by clicking on it in the list. You can go back and
forth between states in this way as much as you please, without
losing any information or consuming any resources. In most
cases, the changes are very fast.
</p>
<p>
At the bottom of the dialog are three buttons:
</p>
<div class="itemizedlist">
<ul type="disc">
<li>
<p><b>Undo. </b>
This button has the same effect as choosing
<span class="guimenu">Edit</span>-><span class="guimenuitem">Undo</span>
from the menu, or pressing
<span><b class="keycap">Ctrl</b></span>-<span><b class="keycap">Z</b></span>;
it reverts the image to the next state back in the undo
history.
</p>
</li>
<li>
<p><b>Redo. </b>
This button has the same effect as choosing
<span class="guimenu">Edit</span>-><span class="guimenuitem">Redo</span>
from the menu, or pressing
<span><b class="keycap">Ctrl</b></span>-<span><b class="keycap">Y</b></span>;
it advances the image to the next state forward in the undo
history.
</p>
</li>
<li>
<p><b>Clear Undo History. </b>
This button removes all contents from the undo history except
the current state. If you press it, you are asked to confirm
that you really want to do this. The only reason for doing it
would be if you are very constrained for memory.
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