k1 - SVG: Scalable Vector Graphics

The k1 attribute defines one of the values to be used within the 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

Only one element is using this attribute: <feComposite>

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

<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" />
  </filter>

  <image href="https://mdn.mozillademos.org/files/12668/MDN.svg" x="0" y="0"
      width="200" height="200" style="filter: url(#composite1);" />
  <image href="https://mdn.mozillademos.org/files/12668/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 'k1' in that specification.	Working Draft	No change
Scalable Vector Graphics (SVG) 1.1 (Second Edition) The definition of 'k1' in that specification.	Recommendation	Initial definition

Browser compatibility

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`k1`	Chrome Full support 1	Edge Full support ≤79	Firefox ?	IE ?	Opera No support No	Safari ?	WebView Android Full support Yes	Chrome Android Full support Yes	Firefox Android ?	Opera Android ?	Safari iOS ?	Samsung Internet Android Full support Yes

Legend

Full support: Full support
No support: No support
Compatibility unknown: Compatibility unknown