📄 svg_filters_gaussian.asp
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<h1>SVG Gaussian Blur</h1>
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<p class="intro">An SVG Filter must be defined within a <defs> tag.</p>
<hr />
<h2>Gaussian Blur</h2>
<p>The <filter> tag is used to define an SVG filter. The <filter> tag has a
required id attribute which identifies which filter will be applied to the
graphic.</p>
<p>The <filter> tag must be nested within a <defs> tag. The <defs> tag is short
for definitions and it allows definition of special
elements such as filter.</p>
<p>Copy the following code into Notepad and save
the file as "filter1.svg". Place the file in your Web directory:</p>
<table width="100%" border="1" class="ex" cellspacing="0"><tr><td>
<pre><?xml version="1.0" standalone="no"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd"></pre>
<pre><svg width="100%" height="100%" version="1.1"
xmlns="http://www.w3.org/2000/svg"></pre>
<pre><defs>
<filter id="Gaussian_Blur">
<feGaussianBlur in="SourceGraphic" stdDeviation="3" />
</filter>
</defs></pre>
<pre><ellipse cx="200" cy="150" rx="70" ry="40"
style="fill:#ff0000;stroke:#000000;
stroke-width:2;filter:url(#Gaussian_Blur)"/></pre>
<pre></svg></pre>
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<p><b>Code explanation:</b></p>
<ul>
<li>The id attribute of the <filter> tag defines a unique name for the filter
(the same filter can be used by many elements in the document)</li>
<li>The filter:url(#Gaussian_Blur) property is used to link an element to a
filter. The # character must be used when linking to the filters id</li>
<li>The filter effect is defined with the <feGaussianBlur> tag. The fe
prefix is used for all filters</li>
<li>The stdDeviation attribute of the <feGaussianBlur> tag defines the amount of
the blur</li>
<li>The in="SourceGraphic" part defines that the effect is created from
the whole image</li>
</ul>
<p><a target="_blank" href="filter1.svg">View example</a></p>
<p>Another example with a different stdDeviation:</p>
<table width="100%" border="1" class="ex" cellspacing="0"><tr><td>
<pre><?xml version="1.0" standalone="no"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd"></pre>
<pre><svg width="100%" height="100%" version="1.1"
xmlns="http://www.w3.org/2000/svg"></pre>
<pre><defs>
<filter id="Gaussian_Blur">
<feGaussianBlur in="SourceGraphic" stdDeviation="20"/>
</filter>
</defs></pre>
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