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SVG Gaussian Blur

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An SVG Filter must be defined within a <defs> tag.


Gaussian Blur

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.

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.

Copy the following code into Notepad and save the file as "filter1.svg". Place the file in your Web directory:

<?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">
<svg width="100%" height="100%" version="1.1"
xmlns="http://www.w3.org/2000/svg">
<defs>
<filter id="Gaussian_Blur">
<feGaussianBlur in="SourceGraphic" stdDeviation="3" />
</filter>
</defs>
<ellipse cx="200" cy="150" rx="70" ry="40"
style="fill:#ff0000;stroke:#000000;
stroke-width:2;filter:url(#Gaussian_Blur)"/>
</svg>

Code explanation:

View example

Another example with a different stdDeviation:

<?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">
<svg width="100%" height="100%" version="1.1"
xmlns="http://www.w3.org/2000/svg">
<defs>
<filter id="Gaussian_Blur">
<feGaussianBlur in="SourceGraphic" stdDeviation="20"/>
</filter>
</defs>
<ellipse cx="200" cy="150" rx="70" ry="40"
style="fill:#ff0000;stroke:#000000;
stroke-width:2;filter:url(#Gaussian_Blur)"/>
</svg>

View example


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From http://www.w3schools.com (Copyright Refsnes Data)