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  4.   <head>
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  6.     <title>2.┬áSelection Tools</title>
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  13.     <link rel="next" href="ch03s02s02.html" title="2.2.┬áRectangle Selection Tool" />
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  15.   <body>
  16.     <div xmlns="" class="navheader">
  17.       <table width="100%" summary="Navigation header">
  18.         <tr>
  19.           <th colspan="3" align="center" id="chaptername">Chapter┬á3.┬áToolbox</th>
  20.         </tr>
  21.         <tr>
  22.           <td width="20%" align="left"><a accesskey="p" href="ch03.html">Prev</a>┬á</td>
  23.           <th width="60%" align="center" id="sectionname">2.┬áSelection Tools</th>
  24.           <td width="20%" align="right">┬á<a accesskey="n" href="ch03s02s02.html">Next</a></td>
  25.         </tr>
  26.       </table>
  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-tools-selection"></a>2.┬áSelection Tools</h2>
  34.           </div>
  35.         </div>
  36.       </div>
  37.       <div class="sect2" lang="en" xml:lang="en">
  38.         <div class="titlepage">
  39.           <div>
  40.             <div>
  41.               <h3 class="title"><a id="gimp-tool-select"></a>2.1.┬áCommon Features</h3>
  42.             </div>
  43.           </div>
  44.         </div>
  45.         <a id="id3432221" class="indexterm"></a>
  46.         <p>
  47.     Selection tools are designed to select regions
  48.     from images or layers so you can work on them without affecting
  49.     the unselected areas.  Each tool has its own individual
  50.     properties, but the selection tools also share a number of options
  51.     and features in common.  These common features are described here;
  52.     the variations are explained in the following sections for
  53.     each tool specifically.  If you need help with what a "selection" is
  54.     in Gimp, and how it works, see <a href="ch02s04s04.html" title="4.4.┬áThe Selection">
  55.     Selection</a>.
  56.   </p>
  57.         <p>
  58.     There are six selection tools:
  59.   </p>
  60.         <div class="itemizedlist">
  61.           <ul type="disc">
  62.             <li>
  63.               <p>
  64.         Rectangle Select
  65.       </p>
  66.             </li>
  67.             <li>
  68.               <p>
  69.         Ellipse Select
  70.       </p>
  71.             </li>
  72.             <li>
  73.               <p>
  74.         Free Select (the Lasso)
  75.       </p>
  76.             </li>
  77.             <li>
  78.               <p>
  79.         Select Contiguous Regions (the Magic Wand)
  80.       </p>
  81.             </li>
  82.             <li>
  83.               <p>
  84.         Select by Color
  85.       </p>
  86.             </li>
  87.             <li>
  88.               <p>
  89.         Select Shapes from Image (Intelligent Scissors)
  90.       </p>
  91.             </li>
  92.           </ul>
  93.         </div>
  94.         <p>
  95.     In some ways the Path tool can also be thought of as a selection
  96.     tool:  any closed path can be converted into a selection.  It also
  97.     can do a great deal more, though, and does not share the same set
  98.     of options with the other selection tools.
  99.   </p>
  100.         <div class="simplesect" lang="en" xml:lang="en">
  101.           <div class="titlepage">
  102.             <div>
  103.               <div>
  104.                 <h4 class="title"><a id="id3432308"></a>Key modifiers (Defaults)</h4>
  105.               </div>
  106.             </div>
  107.           </div>
  108.           <p>
  109.       The behavior of selection tools is modified if you hold down the
  110.       <span><b class="keycap">Ctrl</b></span>, <span><b class="keycap">Shift</b></span>, and/or
  111.       <span><b class="keycap">Alt</b></span> keys while you use them.  
  112.     </p>
  113.           <div class="note" style="margin-left: 0.5in; margin-right: 0.5in;">
  114.             <table border="0" summary="Note">
  115.               <tr>
  116.                 <td rowspan="2" align="center" valign="top" width="25">
  117.                   <img alt="[Note]" src="../images/note.png" />
  118.                 </td>
  119.                 <th align="left">Note</th>
  120.               </tr>
  121.               <tr>
  122.                 <td colspan="2" align="left" valign="top">
  123.                   <p>
  124.         Advanced users find the modifier keys very valuable, but novice
  125.         users often find them confusing.  Fortunately, it is possible
  126.         for most purposes to use the Mode buttons (described below)
  127.         instead of modifier keys.  
  128.       </p>
  129.                 </td>
  130.               </tr>
  131.             </table>
  132.           </div>
  133.           <div class="variablelist">
  134.             <dl>
  135.               <dt>
  136.                 <span class="term">
  137.                   <span>
  138.                     <b class="keycap">Ctrl</b>
  139.                   </span>
  140.                 </span>
  141.               </dt>
  142.               <dd>
  143.                 <p>
  144.             Holding <span><b class="keycap">Ctrl</b></span> while creating a selection can
  145.             have as many as two effects simultaneously. The first effect
  146.             is variable depending on which tool you are using: see the
  147.             individual tool's documentation for this.  The second
  148.             effect, is common to all selection tools: it puts the tool
  149.             into subtraction mode, so that the region you trace out is
  150.             <span class="emphasis"><em>subtracted</em></span> from the pre-existing
  151.             selection.  If you only want one of these actions to take
  152.             place, you can release the <span><b class="keycap">Ctrl</b></span> key prior
  153.             to releasing the <span class="mousebutton">mouse button</span>.
  154.             Doing so will leave the selection in subtraction mode, but
  155.             not perform the tool-specific action.
  156.           </p>
  157.               </dd>
  158.               <dt>
  159.                 <span class="term">
  160.                   <span>
  161.                     <b class="keycap">Alt</b>
  162.                   </span>
  163.                 </span>
  164.               </dt>
  165.               <dd>
  166.                 <p>
  167.             Holding <span><b class="keycap">Alt</b></span> will allow movement of the
  168.             current selection (only its frame, not its content). If the
  169.             whole image is moved instead of the selection only, try
  170.             <span><b class="keycap">Shift+Alt</b></span>.  Note that the
  171.             <span><b class="keycap">Alt</b></span> key is sometimes intercepted by the
  172.             windowing system (meaning that Gimp never knows that it was
  173.             pressed), so this may not work for everybody.
  174.           </p>
  175.               </dd>
  176.               <dt>
  177.                 <span class="term">
  178.                   <span>
  179.                     <b class="keycap">Shift</b>
  180.                   </span>
  181.                 </span>
  182.               </dt>
  183.               <dd>
  184.                 <p>
  185.             As with the <span><b class="keycap">Ctrl</b></span> key, holding down
  186.             <span><b class="keycap">Shift</b></span> while creating a selection can have
  187.             two distinct effects.  The first varies according to which
  188.             tool is used, but it generally involves constraining the
  189.             tool in some way:  for example, it constrains the
  190.             rectangle-select tool to select a
  191.             <span class="emphasis"><em>square</em></span> region.  The second effect is to
  192.             change the selection mode to "addition", so that the region
  193.             traced out is added to the pre-existing selection.If you
  194.             require only one of these actions to take place, you can
  195.             release the <span><b class="keycap">Shift</b></span> key prior to releasing
  196.             the <span class="mousebutton">mouse button</span>. Doing so will
  197.             leave the selection in addition mode, but without any
  198.             constraints.
  199.           </p>
  200.               </dd>
  201.               <dt>
  202.                 <span class="term"><span><b class="keycap">Ctrl</b></span>+<span><b class="keycap">Shift</b></span></span>
  203.               </dt>
  204.               <dd>
  205.                 <p>
  206.             Using
  207.             <span><b class="keycap">Ctrl</b></span>-<span><b class="keycap">Shift</b></span>
  208.               together can do a variety of things, depending on which
  209.               tool is used.  Common to all selection tools is that the
  210.               selection mode will be switched to intersection, so that
  211.               after the operation is finished, the selection will
  212.               consist of the intersection of the region traced out with
  213.               the pre-existing selection. It is an exercise for the
  214.               reader to play with the various combinations available
  215.               when performing selections while holding <span><b class="keycap">Ctrl</b></span>-<span><b class="keycap">Shift</b></span>
  216.               and releasing either both or either prior to releasing the
  217.               <span class="mousebutton">mouse button</span>.
  218.           </p>
  219.               </dd>
  220.             </dl>
  221.           </div>
  222.         </div>
  223.         <div class="simplesect" lang="en" xml:lang="en">
  224.           <div class="titlepage">
  225.             <div>
  226.               <div>
  227.                 <h4 class="title"><a id="id3432578"></a>Options</h4>
  228.               </div>
  229.             </div>
  230.           </div>
  231.           <p>
  232.       Here we describe the tool options that apply to all selection
  233.       tools:  options that apply only to some tools, or that affect
  234.       each tool differently, are described in the sections devoted
  235.       to the individual tools.  The current settings for these
  236.       options can be seen in the Tool Options dialog, which you
  237.       should always have visible when you are using tools.  (Most
  238.       users keep it docked directly below the Toolbox.)  To make the
  239.       interface consistent, the same options are presented for all
  240.       selection tools, even though some of them don't have any
  241.       effect for some of the tools.
  242.     </p>
  243.           <div class="variablelist">
  244.             <dl>
  245.               <dt>
  246.                 <span class="term">Mode</span>
  247.               </dt>
  248.               <dd>
  249.                 <p>
  250.           This determines the way that the selection you create
  251.           is combined with any pre-existing selection.  Note
  252.           that the functions performed by these buttons can be
  253.           duplicated using modifier keys, as described above.  For
  254.           the most part, advanced users use the modifier keys; novice
  255.           users find the mode buttons easier.
  256.         </p>
  257.                 <p>
  258.           </p>
  259.                 <div class="mediaobject">
  260.                   <img src="../images/tool-options/rectsel-mode-replace.png" />
  261.                 </div>
  262.                 <p>
  263.           Replace mode will cause any existing selection to be destroyed
  264.           or replaced when the new selection is created.
  265.         </p>
  266.                 <p>
  267.           </p>
  268.                 <div class="mediaobject">
  269.                   <img src="../images/tool-options/rectsel-mode-add.png" />
  270.                 </div>
  271.                 <p>
  272.           Add mode will cause the new selection to be added to any
  273.           existing selection regions.
  274.         </p>
  275.                 <p>
  276.           </p>
  277.                 <div class="mediaobject">
  278.                   <img src="../images/tool-options/rectsel-mode-subtract.png" />
  279.                 </div>
  280.                 <p>
  281.           Subtract mode will remove the new selection area from any
  282.           existing selection regions.
  283.         </p>
  284.                 <p>
  285.           </p>
  286.                 <div class="mediaobject">
  287.                   <img src="../images/tool-options/rectsel-mode-intersect.png" />
  288.                 </div>
  289.                 <p>
  290.           Intersection mode will make a new selection from the area
  291.           where the existing selection region and the new selection region
  292.           overlap. 
  293.         </p>
  294.               </dd>
  295.               <dt>
  296.                 <span class="term">Antialiasing</span>
  297.               </dt>
  298.               <dd>
  299.                 <p>
  300.           This option only affects a few of the selection tools:  it
  301.           causes the boundary of the selection to be drawn more
  302.           smoothly. 
  303.         </p>
  304.               </dd>
  305.               <dt>
  306.                 <span class="term">Feather Edges</span>
  307.               </dt>
  308.               <dd>
  309.                 <p>
  310.           This options allows the boundary of the selection to be
  311.           blurred, so that points near the boundary are only partially
  312.           selected.  For further information regarding feathering, see
  313.           the glossary entry 
  314.           <a href="go01.html#glossary-feathering">Feathering</a>.
  315.         </p>
  316.               </dd>
  317.             </dl>
  318.           </div>
  319.         </div>
  320.         <div class="simplesect" lang="en" xml:lang="en">
  321.           <div class="titlepage">
  322.             <div>
  323.               <div>
  324.                 <h4 class="title"><a id="id3432734"></a>Additional information</h4>
  325.               </div>
  326.             </div>
  327.           </div>
  328.           <div class="note" style="margin-left: 0.5in; margin-right: 0.5in;">
  329.             <table border="0" summary="Note">
  330.               <tr>
  331.                 <td rowspan="2" align="center" valign="top" width="25">
  332.                   <img alt="[Note]" src="../images/note.png" />
  333.                 </td>
  334.                 <th align="left">Note</th>
  335.               </tr>
  336.               <tr>
  337.                 <td colspan="2" align="left" valign="top">
  338.                   <p> 
  339.       When moving a selection beyond the boundaries of the image canvas,
  340.       the selection will be cropped to the image area. Selections can
  341.       exist on the visible canvas only. Selection movements and changes
  342.       are, however, kept in the undo buffer should you need to repair an
  343.       error.
  344.       </p>
  345.                 </td>
  346.               </tr>
  347.             </table>
  348.           </div>
  349.         </div>
  350.       </div>
  351.     </div>
  352.     <div class="navfooter">
  353.       <hr />
  354.       <table width="100%" summary="Navigation footer">
  355.         <tr>
  356.           <td width="40%" align="left"><a accesskey="p" href="ch03.html">Prev</a>┬á</td>
  357.           <td width="20%" align="center">
  358.             <a accesskey="u" href="ch03.html">Up</a>
  359.           </td>
  360.           <td width="40%" align="right">┬á<a accesskey="n" href="ch03s02s02.html">Next</a></td>
  361.         </tr>
  362.         <tr>
  363.           <td width="40%" align="left" valign="top">Chapter┬á3.┬áToolbox┬á</td>
  364.           <td width="20%" align="center">
  365.             <a accesskey="h" href="index.html">Home</a>
  366.           </td>
  367.           <td width="40%" align="right" valign="top">┬á2.2.┬áRectangle Selection Tool</td>
  368.         </tr>
  369.       </table>
  370.     </div>
  371.   </body>
  372. </html>
  373.