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  4.   <head>
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  6.     <title>3.2.┬áSelection Tools</title>
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  12.     <link rel="previous" href="ch03s03.html" title="3.┬áTools" />
  13.     <link rel="next" href="ch03s03s02s02.html" title="3.2.2.┬áEllipse Selection Tool" />
  14.   </head>
  15.   <body>
  16.     <div class="navheader">
  17.       <table width="100%" summary="Navigation header">
  18.         <tr>
  19.           <th colspan="3" align="center">3.2.┬áSelection Tools</th>
  20.         </tr>
  21.         <tr>
  22.           <td width="20%" align="left"><a accesskey="p" href="ch03s03.html">Prev</a>┬á</td>
  23.           <th width="60%" align="center">3.┬áTools</th>
  24.           <td width="20%" align="right">┬á<a accesskey="n" href="ch03s03s02s02.html">Next</a></td>
  25.         </tr>
  26.       </table>
  27.       <hr />
  28.     </div>
  29.     <div class="sect2" lang="en" xml:lang="en">
  30.       <div class="titlepage">
  31.         <div>
  32.           <div>
  33.             <h3 class="title"><a id="gimp-tools-selection"></a>3.2.┬áSelection Tools</h3>
  34.           </div>
  35.         </div>
  36.         <div></div>
  37.       </div>
  38.       <div class="sect3" lang="en" xml:lang="en">
  39.         <div class="titlepage">
  40.           <div>
  41.             <div>
  42.               <h4 class="title"><a id="gimp-tool-rect-select"></a>3.2.1.┬áRectangle Selection Tool</h4>
  43.             </div>
  44.           </div>
  45.           <div></div>
  46.         </div>
  47.         <a id="id2946466" class="indexterm"></a>
  48.         <div class="mediaobject">
  49.           <img src="../images/toolbox/toolbox-rectsel.png" />
  50.         </div>
  51.         <p>
  52.     The Rectangle Selection tool is designed to select rectangular regions
  53.     from images or layers so you can work on a specific area of an image or
  54.     layer.
  55.   </p>
  56.         <div class="simplesect" lang="en" xml:lang="en">
  57.           <div class="titlepage">
  58.             <div>
  59.               <div>
  60.                 <h5 class="title"><a id="id2946493"></a>Activate Tool</h5>
  61.               </div>
  62.             </div>
  63.             <div></div>
  64.           </div>
  65.           <div class="itemizedlist">
  66.             <ul type="disc">
  67.               <li>
  68.                 <p>
  69.           The Rectangle Selection Tool can be called in the following
  70.           order, from the image-menu:
  71.           <span class="guimenuitem"><span class="accel">T</span>ools</span>/
  72.           <span class="guimenuitem"><span class="accel">S</span>election
  73.             Tools</span>/<span class="guimenuitem"><span class="accel">R</span>ect
  74.             Select</span>. 
  75.         </p>
  76.               </li>
  77.               <li>
  78.                 <p>
  79.           The Tool can also be called by clicking the tool icon:
  80.           <span class="guiicon">
  81.             <img src="../images/toolbox/rectsel.png" />
  82.           </span>
  83.         </p>
  84.               </li>
  85.             </ul>
  86.           </div>
  87.         </div>
  88.         <div class="simplesect" lang="en" xml:lang="en">
  89.           <div class="titlepage">
  90.             <div>
  91.               <div>
  92.                 <h5 class="title"><a id="id2946543"></a>Key modifiers (Defaults)</h5>
  93.               </div>
  94.             </div>
  95.             <div></div>
  96.           </div>
  97.           <div class="variablelist">
  98.             <dl>
  99.               <dt>
  100.                 <span class="term">Shortcut</span>
  101.               </dt>
  102.               <dd>
  103.                 <p>
  104.             The <span><b class="keycap">r</b></span> key will change the active tool to Rectangle
  105.             Select.
  106.           </p>
  107.               </dd>
  108.               <dt>
  109.                 <span class="term">
  110.                   <span>
  111.                     <b class="keycap">Ctrl</b>
  112.                   </span>
  113.                 </span>
  114.               </dt>
  115.               <dd>
  116.                 <p>
  117.         Holding <span><b class="keycap">Ctrl</b></span> while creating a rectangular
  118.         selection can do up to two things. First, the selection will
  119.         be created using the pixel you started the selection on as a
  120.         center.  Normally, the selection is created using that pixel as
  121.         a corner.  Second, <span><b class="keycap">Ctrl</b></span> will place the
  122.         selection into subtraction mode (see above). If you only
  123.         require one of the actions to take place, you can release the
  124.         <span><b class="keycap">Ctrl</b></span> key prior to releasing the
  125.         <span class="mousebutton">mouse button</span>.  Doing so will leave
  126.         the selection in subtraction mode, but without the center point
  127.         constraint.
  128.           </p>
  129.               </dd>
  130.               <dt>
  131.                 <span class="term">
  132.                   <span>
  133.                     <b class="keycap">Alt</b>
  134.                   </span>
  135.                 </span>
  136.               </dt>
  137.               <dd>
  138.                 <p>
  139.             Holding <span><b class="keycap">Alt</b></span> will allow movement of the current
  140.             selection (only its frame, not its content). If the whole image 
  141.             is moved instead of the selection only, try 
  142.             <span><b class="keycap">Shift+Alt</b></span>
  143.           </p>
  144.               </dd>
  145.               <dt>
  146.                 <span class="term">
  147.                   <span>
  148.                     <b class="keycap">Shift</b>
  149.                   </span>
  150.                 </span>
  151.               </dt>
  152.               <dd>
  153.                 <p>
  154.         Holding <span><b class="keycap">Shift</b></span> while creating a selection will
  155.         perform up to two different things. The first is to add a constraint
  156.         such that the height and width of the selection will remain
  157.         equal (a square). Second, this key modifier will ensure that
  158.         the selection mode is changed to addition (see above). If you
  159.         require only one of these actions to take place, you can
  160.         release the <span><b class="keycap">Shift</b></span> key prior to releasing the
  161.         <span class="mousebutton">mouse button</span>. Doing so will leave
  162.         the selection in addition mode, but without the height and
  163.         width constraints.
  164.           </p>
  165.               </dd>
  166.               <dt>
  167.                 <span class="term"><span><b class="keycap">Ctrl</b></span>+<span><b class="keycap">Shift</b></span></span>
  168.               </dt>
  169.               <dd>
  170.                 <p>
  171.             Using
  172.             <span><b class="keycap">Ctrl</b></span>-<span><b class="keycap">Shift</b></span>
  173.         can do a variety of things. Both keys alone will do up to two
  174.         things. Firstly the selection mode will be switched to
  175.         intersection (or union). Secondly, the selection will have both
  176.         the center point constraint discussed above and the height and
  177.         width constraints (also discussed above). It is an exercise for
  178.         the reader to play with the various combinations available when
  179.         performing rectangular selections while holding
  180.             <span><b class="keycap">Ctrl</b></span>-<span><b class="keycap">Shift</b></span>
  181.             and releasing either both or either prior to releasing the
  182.             <span class="mousebutton">mouse button</span>.
  183.           </p>
  184.               </dd>
  185.             </dl>
  186.           </div>
  187.         </div>
  188.         <div class="simplesect" lang="en" xml:lang="en">
  189.           <div class="titlepage">
  190.             <div></div>
  191.             <div></div>
  192.           </div>
  193.           <div class="variablelist">
  194.             <p class="title">
  195.               <b>Options</b>
  196.             </p>
  197.             <dl>
  198.               <dt>
  199.                 <span class="term">Overview</span>
  200.               </dt>
  201.               <dd>
  202.                 <p>
  203.         The available tool options for Rectangle Select can be accessed
  204.         by double clicking the Rectangle Select tool icon. <span class="guiicon">
  205.             <img src="../images/toolbox/rectsel.png" />
  206.           </span>
  207.         </p>
  208.               </dd>
  209.               <dt>
  210.                 <span class="term">Mode</span>
  211.               </dt>
  212.               <dd>
  213.                 <p>
  214.           </p>
  215.                 <div class="mediaobject">
  216.                   <img src="../images/tool-options/rectsel-mode-replace.png" />
  217.                 </div>
  218.                 <p>
  219.           Replace mode will cause any existing selection to be destroyed or
  220.           replaced when the new selection is created.
  221.         </p>
  222.                 <p>
  223.           </p>
  224.                 <div class="mediaobject">
  225.                   <img src="../images/tool-options/rectsel-mode-add.png" />
  226.                 </div>
  227.                 <p>
  228.       Add mode will cause the new selection to be added to any existing
  229.       selection regions.
  230.         </p>
  231.                 <p>
  232.           </p>
  233.                 <div class="mediaobject">
  234.                   <img src="../images/tool-options/rectsel-mode-subtract.png" />
  235.                 </div>
  236.                 <p>
  237.           Subtract mode will remove the new selection area from any
  238.           existing selection regions.
  239.         </p>
  240.                 <p>
  241.           </p>
  242.                 <div class="mediaobject">
  243.                   <img src="../images/tool-options/rectsel-mode-intersect.png" />
  244.                 </div>
  245.                 <p>
  246.           Intersection mode will make a new selection from the area
  247.           where the existing selection region and the new selection region
  248.           overlap. 
  249.         </p>
  250.               </dd>
  251.               <dt>
  252.                 <span class="term">Antialiasing</span>
  253.               </dt>
  254.               <dd>
  255.                 <p>
  256.           This option performs no function for this tool and is present to
  257.           unify the user interface between the various selection types.
  258.         </p>
  259.               </dd>
  260.               <dt>
  261.                 <span class="term">Feather Edges</span>
  262.               </dt>
  263.               <dd>
  264.                 <p>
  265.       The <span class="guilabel">Radius</span> slider adjusts the amount of
  266.       feathering in pixels for the next selection that is created. For
  267.       further information regarding feathering, see the glossary entry
  268.       <a href="go01.html#glossary-feathering">Feathering</a>.
  269.         </p>
  270.               </dd>
  271.               <dt>
  272.                 <span class="term">Auto Shrink Selection</span>
  273.               </dt>
  274.               <dd>
  275.                 <p>
  276.       The <span class="guilabel">Auto Shrink Selection</span> checkbox will make
  277.       the next selection automatically shrink to the nearest
  278.       rectangular shape available on the image layer if one can be
  279.       detected.
  280.         </p>
  281.                 <p>
  282.       If <span class="guilabel">Sample Merged</span> is also enabled, then the
  283.       Auto Shrink will use the pixel information from all the
  284.       layers of the image. For further information regarding Sample
  285.       Merge, see the glossary entry <a href="go01.html#glossary-samplemerge">Sample Merge</a>.
  286.         </p>
  287.               </dd>
  288.               <dt>
  289.                 <span class="term">Fixed Size</span>
  290.               </dt>
  291.               <dd>
  292.                 <p>
  293.       Enabling <span class="guilabel">Fixed Size</span> will allow you to
  294.       manually specify a size for the selection using the
  295.       <span class="guilabel">Width</span>, <span class="guilabel">Height</span>, and
  296.       <span class="guilabel">Unit</span> controls.
  297.         </p>
  298.               </dd>
  299.               <dt>
  300.                 <span class="term">Fixed Aspect Ratio</span>
  301.               </dt>
  302.               <dd>
  303.                 <p>
  304.           This option allows you to resize the selection while keeping
  305.           the aspect ratio constant.
  306.         </p>
  307.               </dd>
  308.             </dl>
  309.           </div>
  310.         </div>
  311.         <div class="simplesect" lang="en" xml:lang="en">
  312.           <div class="titlepage">
  313.             <div>
  314.               <div>
  315.                 <h5 class="title"><a id="id2946946"></a>Additional information</h5>
  316.               </div>
  317.             </div>
  318.             <div></div>
  319.           </div>
  320.           <div class="note" style="margin-left: 0.5in; margin-right: 0.5in;">
  321.             <table border="0" summary="Note">
  322.               <tr>
  323.                 <td rowspan="2" align="center" valign="top" width="25">
  324.                   <img alt="[Note]" src="../images/note.png" />
  325.                 </td>
  326.                 <th align="left">Note</th>
  327.               </tr>
  328.               <tr>
  329.                 <td colspan="2" align="left" valign="top">
  330.       When moving a selection beyond the boundaries of the image canvas,
  331.       the selection will be cropped to the image area. Selections can
  332.       exist on the visible canvas only. Selection movements and changes
  333.       are, however, kept in the undo buffer should you need to 
  334.       repair an error.
  335.     </td>
  336.               </tr>
  337.             </table>
  338.           </div>
  339.         </div>
  340.       </div>
  341.     </div>
  342.     <div class="navfooter">
  343.       <hr />
  344.       <table width="100%" summary="Navigation footer">
  345.         <tr>
  346.           <td width="40%" align="left"><a accesskey="p" href="ch03s03.html">Prev</a>┬á</td>
  347.           <td width="20%" align="center">
  348.             <a accesskey="u" href="ch03s03.html">Up</a>
  349.           </td>
  350.           <td width="40%" align="right">┬á<a accesskey="n" href="ch03s03s02s02.html">Next</a></td>
  351.         </tr>
  352.         <tr>
  353.           <td width="40%" align="left" valign="top">3.┬áTools┬á</td>
  354.           <td width="20%" align="center">
  355.             <a accesskey="h" href="index.html">Home</a>
  356.           </td>
  357.           <td width="40%" align="right" valign="top">┬á3.2.2.┬áEllipse Selection Tool</td>
  358.         </tr>
  359.       </table>
  360.     </div>
  361.   </body>
  362. </html>
  363.