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<th colspan="3" align="center">3.3.9. Convolver</th>
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<div class="sect3" lang="en" xml:lang="en">
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<div class="titlepage">
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<h4 class="title"><a id="gimp-tool-convolve"></a>3.3.9. Convolver</h4>
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<a id="id2953155" class="indexterm"></a>
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<div class="mediaobject">
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<img src="../images/toolbox/toolbox-blur.png" />
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The Convolve tool uses the current brush to blur or sharpen your image.
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<div class="simplesect" lang="en" xml:lang="en">
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<div class="titlepage">
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<h5 class="title"><a id="id2953188"></a>Activate Tool</h5>
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<div class="itemizedlist">
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The Convolver can be called in the following
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order, from the image-menu:
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<span class="guimenuitem"><span class="accel">T</span>ools</span>/
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<span class="guimenuitem"><span class="accel">P</span>aint
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Tools</span>/<span class="guimenuitem">Con<span class="accel">v</span>olve
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The Tool can also be called by clicking the tool icon:
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<span class="guiicon">
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<img src="../images/toolbox/blur.png" />
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<div class="simplesect" lang="en" xml:lang="en">
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<div class="titlepage">
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<h5 class="title"><a id="id2953251"></a>Key modifiers (Defaults)</h5>
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<div class="variablelist">
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<span class="term">Shortcut</span>
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The key <span><b class="keycap">V</b></span> will change the active tool to
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<b class="keycap">Ctrl</b>
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<span><b class="keycap">Ctrl</b></span> toggles between blur and sharpen modes.
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The mode will remain switched until Ctrl is released.
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<b class="keycap">Shift</b>
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<span><b class="keycap">Shift</b></span> places the convolve tool into straight
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line mode. Holding Shift while clicking
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<span class="mousebutton">Button1</span> will convolve in a straight
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line. Consecutive clicks will continue convolving in straight
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lines that originate from the end of the last line.
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<div class="simplesect" lang="en" xml:lang="en">
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<div class="titlepage">
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<div class="variablelist">
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<span class="term">Overview</span>
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The available tool options for the Convolver Tool can be accessed
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double clicking the Convolver Tool icon.
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<span class="guiicon">
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<img src="../images/toolbox/blur.png" />
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<span class="term">Opacity</span>
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The Opacity slider sets the transparency level for the
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operation. A higher opacity setting results in a more opaque
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render and a lower setting results in a more transparent one.
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<span class="term">Brush</span>
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Indicates the active brush. Clicking on the brush icon
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opens the brush selection dialog.
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<span class="term">Hard Edge</span>
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By default the Convolver softens the edges of an area blurred or
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The <span class="guilabel">Hard Edge</span> toggle changes this behavior.
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Any area convolved while this option is active will be convolved with
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no softening of the edge of the brush used.
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<span class="term">Pressure Sensitivity</span>
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The Pressure Sensitivity section sets whether hardness, rate, or
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size will be affected by pressure for input devices that support
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<span class="term">Fade Out</span>
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This option sets the stroke to fade out after the specified
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distance. The stroke will fade to transparency at the completion
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<span class="term">Convolve Type</span>
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<span class="guilabel">Blur</span> mode blurs the image colors into each
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other. The result will be a smooth transition between colors, but
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will always be darker than the original colors.
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<span class="guilabel">Sharpen</span> mode causes neighboring pixels with
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similar colors to converge. Used judiciously, blurry edges can be
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sharpened somewhat, but if applied repeatedly it can produce
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The <span class="guilabel">rate</span> slider sets the strength of the
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