baseFrequency

The baseFrequency attribute represents the base frequency parameter for the noise function of the <feTurbulence> filter primitive.

You can use this attribute with the following SVG elements:

<feTurbulence>

Example

<svg viewBox="0 0 420 200" xmlns="http://www.w3.org/2000/svg">
  <filter id="noise1" x="0" y="0" width="100%" height="100%">
    <feTurbulence baseFrequency="0.025" />
  </filter>
  <filter id="noise2" x="0" y="0" width="100%" height="100%">
    <feTurbulence baseFrequency="0.05" />
  </filter>

  <rect x="0" y="0" width="200" height="200" style="filter: url(#noise1);" />
  <rect x="0" y="0" width="200" height="200" style="filter: url(#noise2); transform: translateX(220px);" />
</svg>

Usage notes

Value	<number-optional-number>
Default value	`0`
Animatable	Yes

<number-optional-number>

If two numbers are provided, the first one represents the base frequency in the horizontal direction and the second one the base frequency in the vertical direction. If one number is provided, then that value is used for both x and y.

Negative values are forbidden.

Example

<svg width="200" height="200" viewBox="0 0 220 220"
     xmlns="http://www.w3.org/2000/svg">
  <filter id="displacementFilter">
    <feTurbulence type="turbulence" baseFrequency="0.05"
        numOctaves="2" result="turbulence"/>
    <feDisplacementMap in2="turbulence" in="SourceGraphic"
        scale="50" xChannelSelector="R" yChannelSelector="G"/>
  </filter>

  <circle cx="100" cy="100" r="100"
      style="filter: url(#displacementFilter)"/>
</svg>

Specifications

Specification	Status	Comment
Filter Effects Module Level 1 The definition of 'baseFrequency' in that specification.	Working Draft	No change
Scalable Vector Graphics (SVG) 1.1 (Second Edition) The definition of 'baseFrequency' in that specification.	Recommendation	Initial definition

Browser compatibility

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	WebView Android	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet
`baseFrequency`	Yes	12 Partially supported, see bug 12382004.	4	Yes Partially supported, see bug 12382004.	9	?	Yes	Yes	Yes	Yes	?	Yes

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https://developer.mozilla.org/en-US/docs/Web/SVG/Attribute/baseFrequency