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  6.     <title>3.2.2.┬áEllipse Selection Tool</title>
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  13.     <link rel="next" href="ch03s03s02s03.html" title="3.2.3.┬áFree Selection Tool" />
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  15.   <body>
  16.     <div class="navheader">
  17.       <table width="100%" summary="Navigation header">
  18.         <tr>
  19.           <th colspan="3" align="center">3.2.2.┬áEllipse Selection Tool</th>
  20.         </tr>
  21.         <tr>
  22.           <td width="20%" align="left"><a accesskey="p" href="ch03s03s02.html">Prev</a>┬á</td>
  23.           <th width="60%" align="center">3.2.┬áSelection Tools</th>
  24.           <td width="20%" align="right">┬á<a accesskey="n" href="ch03s03s02s03.html">Next</a></td>
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  27.       <hr />
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  29.     <div class="sect3" lang="en" xml:lang="en">
  30.       <div class="titlepage">
  31.         <div>
  32.           <div>
  33.             <h4 class="title"><a id="gimp-tool-ellipse-select"></a>3.2.2.┬áEllipse Selection Tool</h4>
  34.           </div>
  35.         </div>
  36.         <div></div>
  37.       </div>
  38.       <a id="id2946970" class="indexterm"></a>
  39.       <div class="mediaobject">
  40.         <img src="../images/toolbox/toolbox-ellipsel.png" />
  41.       </div>
  42.       <p>
  43.     The Ellipse Selection tool is designed to select circular and
  44.     elliptical regions from images or layers so you can work on specific
  45.     areas of an image or layer.
  46.   </p>
  47.       <div class="simplesect" lang="en" xml:lang="en">
  48.         <div class="titlepage">
  49.           <div>
  50.             <div>
  51.               <h5 class="title"><a id="id2946998"></a>Activate Tool</h5>
  52.             </div>
  53.           </div>
  54.           <div></div>
  55.         </div>
  56.         <div class="itemizedlist">
  57.           <ul type="disc">
  58.             <li>
  59.               <p>
  60.           The Ellipse Selection Tool can be called in the following
  61.           order, from the image-menu:
  62.           <span class="guimenuitem"><span class="accel">T</span>ools</span>/
  63.           <span class="guimenuitem"><span class="accel">S</span>election
  64.             Tools</span>/<span class="guimenuitem"><span class="accel">E</span>llipse
  65.             Select.</span> 
  66.         </p>
  67.             </li>
  68.             <li>
  69.               <p>
  70.           The Tool can also be called by clicking the tool icon:
  71.           <span class="guiicon">
  72.             <img src="../images/toolbox/ellipsel.png" />
  73.           </span>
  74.         </p>
  75.             </li>
  76.           </ul>
  77.         </div>
  78.       </div>
  79.       <div class="simplesect" lang="en" xml:lang="en">
  80.         <div class="titlepage">
  81.           <div>
  82.             <div>
  83.               <h5 class="title"><a id="id2947048"></a>Key modifiers (Defaults)</h5>
  84.             </div>
  85.           </div>
  86.           <div></div>
  87.         </div>
  88.         <div class="variablelist">
  89.           <dl>
  90.             <dt>
  91.               <span class="term">Shortcut</span>
  92.             </dt>
  93.             <dd>
  94.               <p>
  95.             The <span><b class="keycap">e</b></span> key will change the active tool to
  96.             Ellipse
  97.             Select.
  98.           </p>
  99.             </dd>
  100.             <dt>
  101.               <span class="term">
  102.           <span><b class="keycap">Ctrl</b></span>
  103.         </span>
  104.             </dt>
  105.             <dd>
  106.               <p>
  107.             Holding <span><b class="keycap">Ctrl</b></span> while creating an elliptical
  108.             selection can do up to two things. First, the selection
  109.             will be
  110.             created using the pixel you started the selection on as a
  111.             center.
  112.             Normally, the selection is created using that pixel as a
  113.             corner.
  114.             Second, <span><b class="keycap">Ctrl</b></span> will place the selection
  115.             into
  116.             subtraction mode (see above). If you require only one ofthe
  117.             actions to take place, you can release the <span><b class="keycap">Ctrl</b></span>
  118.             key prior to releasing the <span class="mousebutton">mouse button</span>.
  119.             Doing so will leave the selection in subtraction mode, but
  120.             without
  121.             the center point constraint.
  122.           </p>
  123.             </dd>
  124.             <dt>
  125.               <span class="term">
  126.           <span><b class="keycap">Alt</b></span>
  127.         </span>
  128.             </dt>
  129.             <dd>
  130.               <p>
  131.             Holding <span><b class="keycap">Alt</b></span> will allow movement of the current
  132.             selection (only its frame, not its content). If the whole image 
  133.             is moved instead of the selection only, try 
  134.             <span><b class="keycap">Shift+Alt</b></span>
  135.           </p>
  136.             </dd>
  137.             <dt>
  138.               <span class="term">
  139.           <span><b class="keycap">Shift</b></span>
  140.         </span>
  141.             </dt>
  142.             <dd>
  143.               <p>
  144.             Holding <span><b class="keycap">Shift</b></span> while creating a selection will
  145.             perform up to two different things. The first is to add a constraint
  146.             such that the height and width of the selection will remain
  147.             equal (a circle). Second, this key modifier will change the 
  148.             selection mode to addition (see above). If you require
  149.             only one of these actions to take place, you can release the
  150.             <span><b class="keycap">Shift</b></span> key prior to releasing the
  151.             <span class="mousebutton">mouse button</span>. Doing so will leave the
  152.             selection in addition mode, but without the height and width
  153.             constraints.
  154.           </p>
  155.             </dd>
  156.             <dt>
  157.               <span class="term">
  158.           <span><b class="keycap">Ctrl</b></span>+<span><b class="keycap">Shift</b></span>
  159.         </span>
  160.             </dt>
  161.             <dd>
  162.               <p>
  163.             Using
  164.             <span><b class="keycap">Ctrl</b></span>-<span><b class="keycap">Shift</b></span>
  165.             can do a variety of things. Both keys alone will do up to
  166.             two
  167.             things. Firstly the selection mode will be switched to
  168.             intersection
  169.             (or union). Secondly, the selection will have both the
  170.             center point
  171.             constraint discussed above and the height and width
  172.             constraints
  173.             (also discussed above). It is an exercise for the reader to
  174.             play
  175.             with the various combinations available when performing
  176.             elliptical
  177.             selections while holding
  178.             <span><b class="keycap">Ctrl</b></span>-<span><b class="keycap">Shift</b></span>
  179.             and releasing either both or either prior to releasing the
  180.             <span class="mousebutton">mouse button</span>.
  181.           </p>
  182.             </dd>
  183.           </dl>
  184.         </div>
  185.       </div>
  186.       <div class="simplesect" lang="en" xml:lang="en">
  187.         <div class="titlepage">
  188.           <div></div>
  189.           <div></div>
  190.         </div>
  191.         <div class="variablelist">
  192.           <p class="title">
  193.             <b>Options</b>
  194.           </p>
  195.           <dl>
  196.             <dt>
  197.               <span class="term">Overview</span>
  198.             </dt>
  199.             <dd>
  200.               <p>
  201.           The available tool options for Ellipse Select can be accessed
  202.           by
  203.           double clicking the Ellipse Select tool icon.
  204.           <span class="guiicon">
  205.             <img src="../images/toolbox/ellipsel.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
  220.           destroyed or
  221.           replaced when the new selection is created.
  222.         </p>
  223.               <p>
  224.           </p>
  225.               <div class="mediaobject">
  226.                 <img src="../images/tool-options/rectsel-mode-add.png" />
  227.               </div>
  228.               <p>
  229.           Add mode will cause the new selection to be added to any
  230.           existing
  231.           selection regions.
  232.         </p>
  233.               <p>
  234.           </p>
  235.               <div class="mediaobject">
  236.                 <img src="../images/tool-options/rectsel-mode-subtract.png" />
  237.               </div>
  238.               <p>
  239.           Subtract mode will remove the new selection area from any
  240.           existing selection regions.
  241.         </p>
  242.               <p>
  243.           </p>
  244.               <div class="mediaobject">
  245.                 <img src="../images/tool-options/rectsel-mode-intersect.png" />
  246.               </div>
  247.               <p>
  248.           Intersection mode will make a new selection from the area
  249.           where the existing selection region and the new selection
  250.           region
  251.           overlap.
  252.         </p>
  253.             </dd>
  254.             <dt>
  255.               <span class="term">Antialiasing</span>
  256.             </dt>
  257.             <dd>
  258.               <p>
  259.           This option will make your selection appear more circular by
  260.           antialiasing the edge of the selection with the neighbouring
  261.           pixels.  Antialiasing is discussed in further detail under the
  262.           glossary entry <a href="go01.html#glossary-antialiasing">Antialiasing</a>.
  263.         </p>
  264.             </dd>
  265.             <dt>
  266.               <span class="term">Feather Edges</span>
  267.             </dt>
  268.             <dd>
  269.               <p>
  270.           The <span class="guilabel">Radius</span> slider adjusts the amount of
  271.           feathering in pixels for the next selection that is created.
  272.           For
  273.           further information regarding feathering, see the glossary
  274.           entry
  275.           <a href="go01.html#glossary-feathering">Feathering</a>.
  276.         </p>
  277.             </dd>
  278.             <dt>
  279.               <span class="term">Auto Shrink Selection</span>
  280.             </dt>
  281.             <dd>
  282.               <p>
  283.           The <span class="guilabel">Auto Shrink Selection</span> checkbox will
  284.           make
  285.           the next selection automatically shrink to the nearest
  286.           elliptical
  287.           shape available on the image layer if one can be detected.
  288.         </p>
  289.               <p>
  290.           If <span class="guilabel">Sample Merged</span> is also enabled, then
  291.           the
  292.           Auto Shrink will use the pixel information from all the
  293.           layers of the image. For further information regarding Sample
  294.           Merge, see the glossary entry <a href="go01.html#glossary-samplemerge">Sample Merged</a>.
  295.         </p>
  296.             </dd>
  297.             <dt></dt>
  298.             <dd></dd>
  299.             <dt>
  300.               <span class="term">Fixed Size</span>
  301.             </dt>
  302.             <dd>
  303.               <p>
  304.           Enabling <span class="guilabel">Fixed Size</span> will allow you to
  305.           manually
  306.           specify a size for the selection using the
  307.           <span class="guilabel">Width</span>, <span class="guilabel">Height</span>, and
  308.           <span class="guilabel">Unit</span> controls.
  309.         </p>
  310.             </dd>
  311.             <dt>
  312.               <span class="term">Fixed Aspect Ratio</span>
  313.             </dt>
  314.             <dd>
  315.               <p>
  316.           The <span class="guilabel">Fixed Aspect Ratio</span> option allows more
  317.           controlled creation of the selection region. By setting the size
  318.           to the desired amount, predetermined areas can be selected with
  319.           ease.  The area can also be specified as a percentage of the
  320.           total layer.
  321.         </p>
  322.             </dd>
  323.           </dl>
  324.         </div>
  325.       </div>
  326.       <div class="simplesect" lang="en" xml:lang="en">
  327.         <div class="titlepage">
  328.           <div>
  329.             <div>
  330.               <h5 class="title"><a id="id2947483"></a>Additional information</h5>
  331.             </div>
  332.           </div>
  333.           <div></div>
  334.         </div>
  335.         <div class="note" style="margin-left: 0.5in; margin-right: 0.5in;">
  336.           <table border="0" summary="Note">
  337.             <tr>
  338.               <td rowspan="2" align="center" valign="top" width="25">
  339.                 <img alt="[Note]" src="../images/note.png" />
  340.               </td>
  341.               <th align="left">Note</th>
  342.             </tr>
  343.             <tr>
  344.               <td colspan="2" align="left" valign="top">
  345.       When moving a selection beyond the boundaries of the image canvas,
  346.       the selection will be cropped to the image area. Selections can
  347.       exist on the visible canvas only. Selection movements and changes
  348.       are, however, kept in the undo buffer should you need to 
  349.       repair an error.
  350.     </td>
  351.             </tr>
  352.           </table>
  353.         </div>
  354.       </div>
  355.     </div>
  356.     <div class="navfooter">
  357.       <hr />
  358.       <table width="100%" summary="Navigation footer">
  359.         <tr>
  360.           <td width="40%" align="left"><a accesskey="p" href="ch03s03s02.html">Prev</a>┬á</td>
  361.           <td width="20%" align="center">
  362.             <a accesskey="u" href="ch03s03s02.html">Up</a>
  363.           </td>
  364.           <td width="40%" align="right">┬á<a accesskey="n" href="ch03s03s02s03.html">Next</a></td>
  365.         </tr>
  366.         <tr>
  367.           <td width="40%" align="left" valign="top">3.2.┬áSelection Tools┬á</td>
  368.           <td width="20%" align="center">
  369.             <a accesskey="h" href="index.html">Home</a>
  370.           </td>
  371.           <td width="40%" align="right" valign="top">┬á3.2.3.┬áFree Selection Tool</td>
  372.         </tr>
  373.       </table>
  374.     </div>
  375.   </body>
  376. </html>
  377.