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:

<feComposite>

Example

html,
body,
svg {
  height: 100%;
}

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

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