k4

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

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

html
<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
Filter Effects Module Level 1
# element-attrdef-fecomposite-k4

Browser compatibility

Report problems with this compatibility data on GitHub
desktopmobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
k4

Legend

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Full support
Full support