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<th colspan="3" align="center" id="chaptername">2.2. Rectangle Selection Tool</th>
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<th width="60%" align="center" id="sectionname">2.2. Rectangle Selection Tool</th>
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<div class="sect2" lang="en" xml:lang="en">
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<div class="titlepage">
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<h3 class="title"><a id="gimp-tool-rect-select"></a>2.2. Rectangle Selection Tool</h3>
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<a id="id3319610" class="indexterm"></a>
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<div class="informalfigure">
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<div class="mediaobject">
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<img src="../images/toolbox/toolbox-rectsel.png" />
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Rectangle Select icon in the Toolbox
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The Rectangle Selection tool is designed to select rectangular
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regions of an image: it is the most basic of the selection tools,
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but very commonly used. For information on selections and how
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they are used in GIMP see <a href="ch02s04s04.html" title="4.4. The Selection">Selections</a>; for information on
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features common to all selection tools see <a href="ch03s02.html#gimp-tool-select" title="2.1. Common Features">Selection Tools</a>.
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This tool is also used for rendering a rectangle on an image. To
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render a filled rectangle, create a rectangular selection, and
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then fill it using the <a href="ch03s06s02.html" title="6.2. Bucket Fill">Bucket Fill tool</a>. To
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create a rectangular outline, the simplest and most flexible
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approach is to create a rectangular selection and then <a href="ch02s04s13.html" title="4.13. Stroking a Selection or Path">stroke</a> it.
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If you want to round the edges of a rectangular selection, the
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easiest method is to shrink it with
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<span class="guimenu">Select</span>-><span class="guimenuitem">Shrink</span>
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from the image menu, and then grow it with
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<span class="guimenu">Select</span>-><span class="guimenuitem">Grow</span>,
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using the same radius both times.
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<div class="simplesect" lang="en" xml:lang="en">
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<div class="titlepage">
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<h4 class="title"><a id="id3320269"></a>How to Activate</h4>
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The Rectangle Selection Tool can be activated from an image
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<span class="guimenu">Tools</span>-><span class="guisubmenu">Selection Tools</span>-><span class="guimenuitem">Rect Select</span>;
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from the Toolbox by clicking on the tool icon
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<span class="guiicon">
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<span class="inlinemediaobject"><img src="../images/toolbox/rectsel.png" /></span>
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or from the keyboard using the shortcut <span><b class="keycap">r</b></span>.
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<div class="simplesect" lang="en" xml:lang="en">
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<div class="titlepage">
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<h4 class="title"><a id="id3320158"></a>Key modifiers</h4>
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<div class="note" style="margin-left: 0.5in; margin-right: 0.5in;">
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<table border="0" summary="Note">
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<img alt="[Note]" src="../images/note.png" />
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<th align="left">Note</th>
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<td colspan="2" align="left" valign="top">
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See <a href="ch03s02.html#gimp-tool-select" title="2.1. Common Features">Selection Tools</a> for
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help with modifier keys that affect all these tools in the same
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way. Only effects that are specific to the Rectangle Select
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tool are explained here.
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<div class="itemizedlist">
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<span><b class="keycap">Ctrl</b></span>: Pressing the Ctrl key after starting
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your selection, and holding it down until you are finished,
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causes your starting point to be used as the center of the
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selected rectangle, instead of a corner. Note that if you
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press the Ctrl key <span class="emphasis"><em>before</em></span> starting to
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make the selection, the resulting selection will be
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subtracted from the existing selection.
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<span><b class="keycap">Shift</b></span>: Pressing the Shift key after starting
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your selection, and holding it down until you are finished,
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constrains the selection to be square. Note that if you
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press the Shift key <span class="emphasis"><em>before</em></span> starting to
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make the selection, the resulting selection will be
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added to the existing selection.
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<span><b class="keycap">Ctrl</b></span>-<span><b class="keycap">Shift</b></span>: Pressing both keys combines the two effects,
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giving you a square selection centered on your starting
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<div class="simplesect" lang="en" xml:lang="en">
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<div class="titlepage">
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<h4 class="title"><a id="id3320133"></a>Tool Options</h4>
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<div class="informalfigure">
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<div class="mediaobject">
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<img src="../images/toolbox/tool-options-rectsel.png" />
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<div class="caption">
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Tool Options for the Rectangle Select tool
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<div class="note" style="margin-left: 0.5in; margin-right: 0.5in;">
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<table border="0" summary="Note">
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<td rowspan="2" align="center" valign="top" width="25">
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<img alt="[Note]" src="../images/note.png" />
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<th align="left">Note</th>
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<td colspan="2" align="left" valign="top">
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See <a href="ch03s02.html#gimp-tool-select" title="2.1. Common Features">Selection Tools</a> for
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help with options that are common to all these tools. Only
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options that are specific to the Rectangle Select
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tool are explained here.
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<div class="variablelist">
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<span class="term">Antialiasing</span>
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This option performs no function for this tool and is present to
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unify the user interface between the various selection types.
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<span class="term">Auto Shrink Selection</span>
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The <span class="guilabel">Auto Shrink Selection</span> checkbox will
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make your next selection automatically shrink to the nearest
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rectangular shape available on the image layer. The
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algorithm for finding the best rectangle to shrink to is
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"intelligent", which in this case means that it sometimes
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does surprisingly sophisticated things, and sometimes does
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surprisingly strange things. In any case, if the region
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that you want to select has a solid-colored surround,
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auto-shrinking will always pick it out correctly. Note that
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the resulting selection does not need to have the
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same shape as the one you sweep out.
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If <span class="guilabel">Sample Merged</span> is also enabled, then Auto
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Shrink will use the pixel information from the visible
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display of the image, rather than just from the active
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layer. For further information regarding Sample Merge, see
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the glossary entry <a href="go01.html#glossary-samplemerge">Sample
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<span class="term">Size Constraints</span>
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<div class="informalfigure">
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<div class="mediaobject">
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<img src="../images/toolbox/tool-options-rectsel-size.png" />
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<div class="caption">
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Size Constraint Option Menu for the Rectangle Select tool
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This menu allows you the option of constraining the shape of
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the rectangle in three different ways.
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<div class="itemizedlist">
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<p><b>Free Select. </b>
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This option places no constraint on the rectangle.
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<p><b>Fixed Size. </b>
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This will allow you to manually specify a size for the
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selection using the Width, Height, and Unit controls.
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<p><b>Fixed Aspect Ratio. </b>
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This option allows you to resize the selection while
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keeping the aspect ratio fixed according to the two numbers
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entered in the Width and Height controls.
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