<feComponentTransfer>
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.
La primitive de filtre SVG <feComponentTransfer>
permet d'effectuer un remappage des composantes de couleur (rouge, bleu, vert et alpha) de chaque pixel. Cela permet notamment de régler la luminosité, le constraste, la balance des couleurs ou encore le seuillage.
Les calculs sont effectués sur les valeurs de couleur non prémultipliées. Chaque canal de couleur est modifié en utilisant le résultat des éléments <feFuncR>
, <feFuncB>
, <feFuncG>
, et <feFuncA>
placés à l'intérieur de la balise.
Contexte d'utilisation
Attributs
Attributs globaux
Attributs spécifiques
Interface DOM
Cet élément implémente l'interface SVGFEComponentTransferElement
.
Exemple
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="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="5%">Default</text>
<rect x="0" y="8%" width="100%" height="20"></rect>
<text x="0" y="26%">Identity</text>
<rect
x="0"
y="29%"
width="100%"
height="20"
style="filter:url(#identity)"></rect>
<text x="0" y="47%">Table lookup</text>
<rect
x="0"
y="50%"
width="100%"
height="20"
style="filter:url(#table)"></rect>
<text x="0" y="68%">Linear function</text>
<rect
x="0"
y="71%"
width="100%"
height="20"
style="filter:url(#linear)"></rect>
<text x="0" y="89%">Gamma function</text>
<rect
x="0"
y="92%"
width="100%"
height="20"
style="filter:url(#gamma)"></rect>
</g>
</svg>
CSS
rect {
fill: url(#rainbow);
}
Résultat
Spécifications
Specification |
---|
Filter Effects Module Level 1 # feComponentTransferElement |
Compatibilité des navigateurs
BCD tables only load in the browser