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k4 - SVG: Scalable Vector Graphics 编辑

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

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="0.3" />
  </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 '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