k4

The k4 attribute defines one of the values to be used within the arithmetic operation of the <feComposite> filter primitive.

The pixel composition is computed using the following formula:

result = k1*i1*i2 + k2*i1 + k3*i2 + k4

You can use this attribute with the following SVG elements:

Example

<svg viewBox="0 0 420 200" xmlns="http://www.w3.org/2000/svg">
  <filter id="composite1" x="0" y="0" width="100%" height="100%">
    <feComposite in2="SourceGraphic" operator="arithmetic" k1="1" k2="0" k3="0" k4="0" />
  </filter>
  <filter id="composite2" x="0" y="0" width="100%" height="100%">
    <feComposite in2="SourceGraphic" operator="arithmetic" k1="10" k2="0" k3="0" k4="0.3" />
  </filter>

  <image href="mdn.svg" x="0" y="0"
      width="200" height="200" style="filter: url(#composite1);" />
  <image href="mdn.svg" x="0" y="0"
      width="200" height="200" style="filter: url(#composite2); transform: translateX(220px);" />
</svg>

Usage notes

Value <number>
Default value 0
Animatable Yes

Specifications

Specification Status Comment
Filter Effects Module Level 1
The definition of 'k4' in that specification.		 Working Draft No change
Scalable Vector Graphics (SVG) 1.1 (Second Edition)
The definition of 'k4' 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
k4
1
≤79
Yes
Yes
15
Yes
Yes
Yes
Yes
14
Yes
1.5

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https://developer.mozilla.org/en-US/docs/Web/SVG/Attribute/k4