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- <title>7.6. Transform</title>
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- <link rel="up" href="ch05s07.html" title="7. Layers" />
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- <th colspan="3" align="center" id="chaptername">7. Layers</th>
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- <td width="20%" align="left"><a accesskey="p" href="ch05s07s05.html">Prev</a> </td>
- <th width="60%" align="center" id="sectionname">7.6. Transform</th>
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- <div class="sect2" lang="en" xml:lang="en">
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- <div>
- <div>
- <h3 class="title"><a id="gimp-layer-transform-menu"></a>7.6. Transform</h3>
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- <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="id3470944"></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>
- </div>
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