Index

The <feMorphology> SVG filter primitive is used to erode or dilate the input image. Its usefulness lies especially in fattening or thinning effects.

Like other filter primitives, it handles color components in the linearRGB {{glossary("color space")}} by default. You can use {{svgattr("color-interpolation-filters")}} to use sRGB instead.

Usage context

{{svginfo}}

Attributes

• {{SVGAttr("in")}}
• {{SVGAttr("operator")}}
• {{SVGAttr("radius")}}
• Filter primitive attributes: {{SVGAttr("x")}}, {{SVGAttr("y")}}, {{SVGAttr("width")}}, {{SVGAttr("height")}}, {{SVGAttr("result")}}

DOM Interface

This element implements the {{domxref("SVGFEMorphologyElement")}} interface.

Examples

Filtering SVG content

SVG

<svg xmlns="http://www.w3.org/2000/svg" width="300" height="180">
  <filter id="erode">
    <feMorphology operator="erode" radius="1" />
  </filter>
  <filter id="dilate">
    <feMorphology operator="dilate" radius="2" />
  </filter>
  <text y="1em">Normal text</text>
  <text id="thin" y="2em">Thinned text</text>
  <text id="thick" y="3em">Fattened text</text>
</svg>

CSS

text {
  font-family: "Helvetica", "Arial", sans-serif;
  font-size: 3em;
}

#thin {
  filter: url("#erode");
}

#thick {
  filter: url("#dilate");
}

{{EmbedLiveSample("Filtering_SVG_content", 340, 180)}}

Filtering HTML content

SVG

<svg xmlns="http://www.w3.org/2000/svg" width="0" height="0">
  <filter id="erode">
    <feMorphology operator="erode" radius="1" />
  </filter>
  <filter id="dilate">
    <feMorphology operator="dilate" radius="2" />
  </filter>
</svg>

<p>Normal text</p>
<p id="thin">Thinned text</p>
<p id="thick">Fattened text</p>

CSS

p {
  margin: 0;
  font-family: "Helvetica", "Arial", sans-serif;
  font-size: 3em;
}

#thin {
  filter: url("#erode");
}

#thick {
  filter: url("#dilate");
}

{{EmbedLiveSample("Filtering_HTML_content", 340, 180)}}

Specifications

{{Specifications}}

Browser compatibility

{{Compat}}

See also

• {{SVGElement("filter")}}
• {{SVGElement("animate")}}
• {{SVGElement("set")}}
• {{SVGElement("feBlend")}}
• {{SVGElement("feColorMatrix")}}
• {{SVGElement("feComponentTransfer")}}
• {{SVGElement("feComposite")}}
• {{SVGElement("feConvolveMatrix")}}
• {{SVGElement("feDiffuseLighting")}}
• {{SVGElement("feDisplacementMap")}}
• {{SVGElement("feFlood")}}
• {{SVGElement("feGaussianBlur")}}
• {{SVGElement("feImage")}}
• {{SVGElement("feMerge")}}
• {{SVGElement("feOffset")}}
• {{SVGElement("feSpecularLighting")}}
• {{SVGElement("feTile")}}
• {{SVGElement("feTurbulence")}}
• SVG tutorial: Filter effects