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- <th colspan="3" align="center" id="chaptername">2. Selection Tools</th>
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- <th width="60%" align="center" id="sectionname">2.7. Scissors Tool</th>
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- <h3 class="title"><a id="gimp-tool-iscissors"></a>2.7. Scissors Tool</h3>
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- <a id="id3434584" class="indexterm"></a>
- <div class="informalfigure">
- <div class="mediaobject">
- <img src="../images/toolbox/toolbox-scissor.png" />
- <div class="caption">
- <p>
- Intelligent Scissors tool icon in the Toolbox.
- </p>
- </div>
- </div>
- </div>
- <p>
- The Intelligent Scissors tool is an interesting piece of
- equipment: it has some features in common with the Lasso,
- some features in common with the Path tool, and some features all
- its own. It is useful when you are trying to select a region
- defined by strong color-changes at the edges. To use the
- Scissors, you click to create a set of "control nodes"
- at the edges of the region you are trying to select. The tool
- produces a continuous curve passing through these control nodes,
- following any high-contrast edges it can find. If you are lucky,
- the path that the tool finds will correspond to the contour you
- are trying to select.
- </p>
- <p>
- Each time you left-click with the mouse, you create a new control
- point, which is connected to the last control point by a curve
- that tries to follow edges in the image. To finish, click on the
- first point (the cursor changes to indicate when you are in the
- right spot). You can adjust the curve by dragging the control
- nodes, or by clicking to create new control nodes. When you are
- satisfied, click anywhere inside the curve to convert it into a
- selection.
- </p>
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- <th align="left">Warning</th>
- </tr>
- <tr>
- <td colspan="2" align="left" valign="top">
- <p>
- Be sure not to click inside the curve until you are completely
- done adjusting it. Once you have converted it into a selection,
- undoing takes you back to zero, and you will have to to start
- constructing the curve again from scratch if you need to change
- it. Also be sure not to switch to a different tool, or again all
- of your carefully created control nodes will be lost.
- </p>
- </td>
- </tr>
- </table>
- </div>
- <p>
- Unfortunately, there seem to be some problems with the
- edge-following logic for this tool, with the result that the
- selections it creates tend to be pretty crude in a lot of cases. A
- good way to clean them up is to switch to <a href="ch04s03s05.html" title="3.5. Quick Mask">QuickMask</a> mode, and use paint tools to
- paint in the problematic parts. On the whole, most people find
- the Path tool to be more useful than the Scissors, because, even
- though it does not have the intelligent edge-finding capability,
- the paths it produces persist until you delete them, and can be
- altered at any time.
- </p>
- <div class="simplesect" lang="en" xml:lang="en">
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- <div>
- <div>
- <h4 class="title"><a id="id3434691"></a>How to Activate</h4>
- </div>
- </div>
- </div>
- <p>
- The Intelligent Scissors can be activated from an image
- menu as
- <span class="guimenu">Tools</span>-><span class="guisubmenu">Selection Tools</span>-><span class="guimenuitem">Intelligent Scissors</span>;
- from the Toolbox by clicking on the tool icon
- <span class="guiicon">
- <span class="inlinemediaobject"><img src="../images/toolbox/scissor.png" /></span>
- </span>;
- or from the keyboard using the shortcut <span><b class="keycap">i</b></span>.
- </p>
- </div>
- <div class="simplesect" lang="en" xml:lang="en">
- <div class="titlepage">
- <div>
- <div>
- <h4 class="title"><a id="id3434748"></a>Key modifiers (Defaults)</h4>
- </div>
- </div>
- </div>
- <p>
- The Fuzzy Select tool does not have any special key modifiers,
- only the ones that affect all selection tools in the same way.
- See <a href="ch03s02.html#gimp-tool-select" title="2.1. Common Features">Selection Tools</a> for
- help with these.
- </p>
- </div>
- <div class="simplesect" lang="en" xml:lang="en">
- <div class="titlepage">
- <div>
- <div>
- <h4 class="title"><a id="id3434770"></a>Options</h4>
- </div>
- </div>
- </div>
- <div class="informalfigure">
- <div class="mediaobject">
- <img src="../images/toolbox/tool-options-scissor.png" />
- <div class="caption">
- <p>
- Tool Options for the Intelligent Scissors
- </p>
- </div>
- </div>
- </div>
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- <table border="0" summary="Note">
- <tr>
- <td rowspan="2" align="center" valign="top" width="25">
- <img alt="[Note]" src="../images/note.png" />
- </td>
- <th align="left">Note</th>
- </tr>
- <tr>
- <td colspan="2" align="left" valign="top">
- <p>
- See <a href="ch03s02.html#gimp-tool-select" title="2.1. Common Features">Selection Tools</a> for
- help with options that are common to all these tools. Only
- options that are specific to the Intelligent Scissors
- tool are explained here.
- </p>
- </td>
- </tr>
- </table>
- </div>
- <div class="variablelist">
- <dl>
- <dt>
- <span class="term">Show Interactive Boundary</span>
- </dt>
- <dd>
- <p>
- If this option is enabled, dragging a control node during
- placement will indicate the path that will be taken by the
- selection boundary. If it is not enabled, the node will be
- shown connected to the previous node by a straight line
- while you are dragging it around, and you won't see the
- resulting path until you release the pointer button. On
- slow systems, if your control nodes are far apart, this may
- give a bit of a speed-up.
- </p>
- </dd>
- </dl>
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