k1

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 k1 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" />
  </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-k1

Browser compatibility

BCD tables only load in the browser