<feComponentTransfer>
The <feComponentTransfer> SVG filter primitive performs color-component-wise remapping of data for each pixel. It allows operations like brightness adjustment, contrast adjustment, color balance or thresholding.
The calculations are performed on non-premultiplied color values. The colors are modified by changing each channel (R, G, B, and A) to the result of what the children <feFuncR>, <feFuncB>, <feFuncG>, and <feFuncA> return. If more than one of the same element is provided, the last one specified is used, and if no element is supplied to modify one of the channels, the effect is the same is if an identity transformation had been given for that channel.
SVG
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 600 300">
<defs>
<linearGradient
id="rainbow"
gradientUnits="userSpaceOnUse"
x1="0"
y1="0"
x2="100%"
y2="0">
<stop offset="0" stop-color="#ff0000"></stop>
<stop offset="0.2" stop-color="#ffff00"></stop>
<stop offset="0.4" stop-color="#00ff00"></stop>
<stop offset="0.6" stop-color="#00ffff"></stop>
<stop offset="0.8" stop-color="#0000ff"></stop>
<stop offset="1" stop-color="#800080"></stop>
</linearGradient>
<filter id="identity" x="0" y="0" width="100%" height="100%">
<feComponentTransfer>
<feFuncR type="identity"></feFuncR>
<feFuncG type="identity"></feFuncG>
<feFuncB type="identity"></feFuncB>
<feFuncA type="identity"></feFuncA>
</feComponentTransfer>
</filter>
<filter id="table" x="0" y="0" width="100%" height="100%">
<feComponentTransfer>
<feFuncR type="table" tableValues="0 0 1 1"></feFuncR>
<feFuncG type="table" tableValues="1 1 0 0"></feFuncG>
<feFuncB type="table" tableValues="0 1 1 0"></feFuncB>
</feComponentTransfer>
</filter>
<filter id="discrete" x="0" y="0" width="100%" height="100%">
<feComponentTransfer>
<feFuncR type="discrete" tableValues="0 0 1 1"></feFuncR>
<feFuncG type="discrete" tableValues="1 1 0 0"></feFuncG>
<feFuncB type="discrete" tableValues="0 1 1 0"></feFuncB>
</feComponentTransfer>
</filter>
<filter id="linear" x="0" y="0" width="100%" height="100%">
<feComponentTransfer>
<feFuncR type="linear" slope="0.5" intercept="0"></feFuncR>
<feFuncG type="linear" slope="0.5" intercept="0.25"></feFuncG>
<feFuncB type="linear" slope="0.5" intercept="0.5"></feFuncB>
</feComponentTransfer>
</filter>
<filter id="gamma" x="0" y="0" width="100%" height="100%">
<feComponentTransfer>
<feFuncR type="gamma" amplitude="4" exponent="7" offset="0"></feFuncR>
<feFuncG type="gamma" amplitude="4" exponent="4" offset="0"></feFuncG>
<feFuncB type="gamma" amplitude="4" exponent="1" offset="0"></feFuncB>
</feComponentTransfer>
</filter>
</defs>
<g font-weight="bold">
<text x="0" y="20">Default</text>
<rect x="0" y="30" width="100%" height="20"></rect>
<text x="0" y="70">Identity</text>
<rect
x="0"
y="80"
width="100%"
height="20"
style="filter:url(#identity)"></rect>
<text x="0" y="120">Table lookup</text>
<rect
x="0"
y="130"
width="100%"
height="20"
style="filter:url(#table)"></rect>
<text x="0" y="170">Discrete table lookup</text>
<rect
x="0"
y="180"
width="100%"
height="20"
style="filter:url(#discrete)"></rect>
<text x="0" y="220">Linear function</text>
<rect
x="0"
y="230"
width="100%"
height="20"
style="filter:url(#linear)"></rect>
<text x="0" y="270">Gamma function</text>
<rect
x="0"
y="280"
width="100%"
height="20"
style="filter:url(#gamma)"></rect>
</g>
</svg>
CSS
rect {
fill: url(#rainbow);
}
Specifications
Browser compatibility
|
Desktop |
Mobile |
|
Chrome |
Edge |
Firefox |
Internet Explorer |
Opera |
Safari |
WebView Android |
Chrome Android |
Firefox for Android |
Opera Android |
Safari on IOS |
Samsung Internet |
feComponentTransfer |
Yes |
12 |
Yes |
Yes |
Yes |
No |
Yes |
Yes |
Yes |
No |
No |
Yes |
in |
Yes |
12 |
Yes |
Yes |
Yes |
No |
Yes |
Yes |
Yes |
No |
No |
Yes |