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<title>7.6. Transform</title>
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<th colspan="3" align="center" id="chaptername">7.6. Transform</th>
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<th width="60%" align="center" id="sectionname">7.6. Transform</th>
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<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h3 class="title"><a id="gimp-layer-transform-menu"></a>7.6. Transform</h3>
</div>
</div>
</div>
<div class="informalfigure">
<div class="mediaobject">
<img src="../images/menus/menus-layer-transform.png" />
<div class="caption">
<p>
The Transform submenu of the Layer menu
</p>
</div>
</div>
</div>
<p>
The Transform submenu of the Layers menu contains operations that
flip or rotate the active layer of the image.
</p>
<div class="simplesect" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h4 class="title"><a id="gimp-layer-flip-horizontal"></a>Flip Horizontally [or Vertically]</h4>
</div>
</div>
</div>
<a id="gimp-layer-flip-vertical"></a>
<p>
These commands can be accessed from an image menubar as
<span class="guimenu">Layer</span>-><span class="guisubmenu">Transform</span>,
followed by <span class="guimenuitem">Flip Horizontally</span> or
<span class="guimenuitem">Flip Vertically</span>
</p>
<p>
"Flip Horizontally" reverses the layer left-to-right, and "Flip
Vertically" reverses it top-to-bottom. Both commands leave the
layer dimensions unchanged; neither causes any degradation of
pixel data in the layer.
</p>
</div>
<div class="simplesect" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h4 class="title"><a id="gimp-layer-rotate-90"></a>Rotate 90 degrees CW [or CCW, or 180 degrees]</h4>
</div>
</div>
</div>
<a id="gimp-layer-rotate-270"></a>
<a id="gimp-layer-rotate-180"></a>
<p>
These commands can be accessed from an image menubar as
<span class="guimenu">Layer</span>-><span class="guisubmenu">Transform</span>,
followed by <span class="guimenuitem">Rotate 90 degrees CW</span>,
<span class="guimenuitem">Rotate 90 degrees CCW</span>, or
<span class="guimenuitem">Rotate 180 degrees</span>.
</p>
<p>
Each of them rotates the layer in the specified way, with no
degradation of pixel data. The shape of the layer is not
altered: note that this may cause it to extend beyond the
bounds of the image. (In GIMP this is permitted, and does not
force the layer to be cropped. You will not, however, be able
to see the parts that extend outside the image unless you resize
the image canvas or move the layer.) The center of the layer
will be located at the same place after rotation as it was
before rotation.
</p>
</div>
<div class="simplesect" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h4 class="title"><a id="id3354884"></a>Arbitrary Rotation</h4>
</div>
</div>
</div>
<p>
This command, accessed from an image menubar as
<span class="guimenu">Layer</span>-><span class="guisubmenu">Transform</span>-><span class="guimenuitem">Arbitrary Rotation</span>,
it is an alternative way of activating the <a href="ch03s04s03.html" title="4.3. Rotate Tool">Rotate tool</a>.
</p>
</div>
<div class="simplesect" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h4 class="title"><a id="gimp-layer-offset"></a>Offset</h4>
</div>
</div>
</div>
<div class="informalfigure">
<div class="mediaobject">
<img src="../images/menus/dialogs-offset-layer.png" />
<div class="caption">
<p>
The "Offset" dialog
</p>
</div>
</div>
</div>
<p>
This command can be accessed from an image menubar as
<span class="guimenu">Layer</span>-><span class="guisubmenu">Transform</span>-><span class="guimenuitem">Offset</span>.
</p>
<p>
"Offset" allows you to shift the <span class="emphasis"><em>contents</em></span>
of the active layer; it does not change the
<span class="emphasis"><em>dimensions</em></span> of the layer. Anything that
gets shifted outside the edges of the layer is cropped away.
Choosing this menu entry brings up a dialog that allows you to
specify how the shift should be performed. You can set
the distance to shift
the layer in the X and Y directions, measuring from the upper
left corner, with positive numbers representing movement to the
right (X) or downward (Y). The default units are pixels, but
you can use the Units menu in the Offset area to change this if
you like: units of "%" are sometimes useful. Pressing the
button labeled "Offset by x/2, y/2" will cause the layer
contents to be shifted exactly half the width and height of the
layer. There are three possible ways to treat the areas left
empty by the shift, specified by "Edge Behavior":
</p>
<div class="itemizedlist">
<ul type="disc">
<li>
<p><b>Wrap around. </b>
This option causes the empty space to be filled with the
parts of the layer that are shifted outside the edges.
</p>
</li>
<li>
<p><b>Fill with background color. </b>
This option causes the empty space to be filled with the
Background color shown in the Color Area of the Toolbox.
</p>
</li>
<li>
<p><b>Make transparent. </b>
This option causes the empty area to be made transparent.
If the layer lacks an alpha channel, "Make transparent" will
not be available.
</p>
</li>
</ul>
</div>
</div>
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<td width="40%" align="left" valign="top">7.5. Transparency </td>
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<a accesskey="h" href="index.html">Home</a>
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