slope

The slope attribute defines the values for linear filters, such as brightness.

The slope attribute is supported by children of the <feComponentTransfer> filter primitive, including the feFunc-RGBA transfer functions. When the type of a transfer function is linear, the slope defines the slope of the linear function.

You can use this attribute with the following SVG component transfer function elements when type="linear" is set:

Note: Originally, the slope attribute was used within <font-face> to indicate the vertical stroke angle of a font. This use case has been deprecated.

Usage notes

Value <number>
Default value 1
Animatable Yes
<number>

This value indicates the slope of the linear component transfer functions.

Examples

In this example, a gradient box has two text elements with linear filters applied. The slopes of the filter transfer functions of each filter differ.

html
<svg
  width="8cm"
  height="4cm"
  viewBox="0 0 800 400"
  xmlns="http://www.w3.org/2000/svg"
  version="1.1">
  <title>Examples of feComponentTransfer operations</title>
  <desc>
    Text strings showing the effects of the slope attribute of the
    feComponentTransfer filter function linear options.
  </desc>
  <defs>
    <linearGradient
      id="MyGradient"
      gradientUnits="userSpaceOnUse"
      x1="100"
      y1="0"
      x2="600"
      y2="0">
      <stop offset="0" stop-color="#ff0000" />
      <stop offset="1" stop-color="#0000ff" />
    </linearGradient>
    <filter
      id="Linear1"
      filterUnits="objectBoundingBox"
      x="0%"
      y="0%"
      width="100%"
      height="100%">
      <feComponentTransfer>
        <feFuncR type="linear" slope="1" />
        <feFuncG type="linear" slope="1" />
        <feFuncB type="linear" slope="1" />
      </feComponentTransfer>
    </filter>
    <filter
      id="Linear2"
      filterUnits="objectBoundingBox"
      x="0%"
      y="0%"
      width="100%"
      height="100%">
      <feComponentTransfer>
        <feFuncR type="linear" slope="0.5" />
        <feFuncG type="linear" slope="2.5" />
        <feFuncB type="linear" slope="5" />
      </feComponentTransfer>
    </filter>
  </defs>
  <rect fill="none" stroke="blue" x="1" y="1" width="798" height="398" />
  <g
    font-family="Verdana"
    font-size="100"
    font-weight="bold"
    fill="url(#MyGradient)">
    <text x="100" y="190" filter="url(#Linear1)">Slope1</text>
    <text x="100" y="290" filter="url(#Linear2)">Slope2</text>
  </g>
</svg>

Specifications

Specification
Filter Effects Module Level 1
# element-attrdef-fecomponenttransfer-slope

Browser compatibility

Desktop Mobile
Chrome Edge Firefox Opera Safari Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet WebView Android
slope 5 12 3 15 6 18 4 14 6 1.0 4.4

© 2005–2024 MDN contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/SVG/Attribute/slope