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SVG uses <filter> element to define filters. <filter> element uses an id attribute to uniquely identify it.Filters are defined within <def> elements and then are referenced by graphics elements by their ids.

SVG provides a rich set of filters. Following is the list of the commonly used filters.

  • feBlend
  • feColorMatrix
  • feComponentTransfer
  • feComposite
  • feConvolveMatrix
  • feDiffuseLighting
  • feDisplacementMap
  • feFlood
  • feGaussianBlur
  • feImage
  • feMerge
  • feMorphology
  • feOffset – filter for drop shadows
  • feSpecularLighting
  • feTile
  • feTurbulence
  • feDistantLight
  • fePointLight
  • feSpotLight

Declaration

Following is the syntax declaration of <filter> element. We’ve shown main attributes only.

<filter
   filterUnits="units to define filter effect region"
   primitiveUnits="units to define primitive filter subregion"
   
   x="x-axis co-ordinate" 
   y="y-axis co-ordinate"     
   
   width="length"
   height="length"
   
   filterRes="numbers for filter region"
   xlink:href="reference to another filter" >
</filter>

Attributes

Sr.No. Name & Description
1 filterUnits − units to define filter effect region. It specifies the coordinate system for the various length values within the filter and for the attributes defining the filter subregion. If filterUnits=”userSpaceOnUse”, values represent values in the current user coordinate system in place at the time when the ‘filter’ element is used. If filterUnits=”objectBoundingBox”, values represent values in fractions or percentages of the bounding box on the referencing element in place at the time when the ‘filter’ element is used. Default is userSpaceOnUse.
2 primitiveUnits − units to define filter effect region. It specifies the coordinate system for the various length values within the filter and for the attributes defining the filter subregion. If filterUnits=”userSpaceOnUse”, values represent values in the current user coordinate system in place at the time when the ‘filter’ element is used. If filterUnits=”objectBoundingBox”, values represent values in fractions or percentages of the bounding box on the referencing element in place at the time when the ‘filter’ element is used. Default is userSpaceOnUse.
3 x − x-axis co-ordinate of the filter bounding box. Defeault is 0.
4 y − y-axis co-ordinate of the filter bounding box. Default is 0.
5 width − width of the filter bounding box. Default is 0.
6 height − height of the filter bounding box. Default is 0.
7 filterRes − numbers representing filter regions.
8 xlink:href − used to refer to another filter.

Example

testSVG.htm

<html>
   <title>SVG Filter</title>
   <body>
   
      <h1>Sample SVG Filter</h1>
   
      <svg width="800" height="800">
      
         <defs>
            <filter id="filter1" x="0" y="0">
               <feGaussianBlur in="SourceGraphic" stdDeviation="8" />
            </filter>
            
            <filter id="filter2" x="0" y="0" width="200%" height="200%">
               <feOffset result="offOut" in="SourceAlpha" dx="20" dy="20" />
               <feGaussianBlur result="blurOut" in="offOut" stdDeviation="10" />
               <feBlend in="SourceGraphic" in2="blurOut" mode="normal" />
            </filter>
         </defs>
         
         <g>
            <text x="30" y="50" >Using Filters (Blur Effect): </text>
            <rect x="100" y="100" width="90" height="90" stroke="green" stroke-width="3"
            fill="green" filter="url(#filter1)" />      
         </g> 
         
      </svg>
   
   </body>
</html>
  • Two <filter> elements defined as filter1 and filter2.

  • feGaussianBlur filter effect defines the blur effect with the amount of blur using stdDeviation.

  • in=”SourceGraphic” defines that the effect is applicable for the entire element.

  • feOffset filter effect is used to create shadow effect. in=”SourceAlpha” defines that the effect is applicable for the alpha part of RGBA graphics.

  • <rect> elements linked the filters using filter attribute.

Output

Open textSVG.htm in Chrome web browser. You can use Chrome/Firefox/Opera to view SVG image directly without any plugin. Internet Explorer 9 and higher also supports SVG image rendering.

Filter with Shadow effect

<html>
   <title>SVG Filter</title>
   <body>
      
      <h1>Sample SVG Filter</h1>
      
      <svg width="800" height="800">
      
         <defs>
            <filter id="filter1" x="0" y="0">
               <feGaussianBlur in="SourceGraphic" stdDeviation="8" />
            </filter>
            
            <filter id="filter2" x="0" y="0" width="200%" height="200%">
               <feOffset result="offOut" in="SourceAlpha" dx="20" dy="20" />
               <feGaussianBlur result="blurOut" in="offOut" stdDeviation="10" />
               <feBlend in="SourceGraphic" in2="blurOut" mode="normal" />
            </filter>
         </defs>
         
         <g>
            <text x="30" y="50" >Using Filters (Shadow Effect): </text>
            <rect x="100" y="100" width="90" height="90" stroke="green" stroke-width="3"
            fill="green" filter="url(#filter2)" />
         </g>
         
      </svg>
   
   </body>
</html>

Output

Open textSVG.htm in Chrome web browser. You can use Chrome/Firefox/Opera to view SVG image directly without any plugin. Internet Explorer 9 and higher also supports SVG image rendering.


Table of Contents
1.svg tutorial

2.svg overview

3.svg shapes

4.svg text

5.svg stroke

6.svg filters

7.svg patterns

8.svg gradients

9.svg interactivity

10.svg linking

11.svg loaders

12.svg dialog box effects

13.svg icons

14.svg clock

15.svg drag

16.svg keypoint

17.svg maps

18.svg amchart

19.svg graph

20.svg flat surface shade

21.svg image filter effect

22.svg text effects

23.svg text with css effects

24.svg arrow effects

25.svg brand effects

26.svg gooey effects

27.svg gradients

28.svg playful effects

29.svg scroll effects

30.svg slide show effects

31.svg tab effects

32.svg raphaeljs effects

33.svg velocityjs effects

34.svg walkwayjs effects

35.svg zpath

36.svg vaguejs effects

37.svg transformation effects

38.svg full screen overlay effects

39.svg laylinepainterjs effects

40.svg demo game

41.svg real time svg ad

42.svg questions and answers tutorialspoing

43.svg quick guide

44.svg useful resources

45.discuss svg


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