Multiple Filters for Single Object in SVG

Question

I want to put two filters on my circle. (Maybe more)

I've tried doing:

filter="url(#f1);url(#f2)"

And:

filter="url(#f1,#f2)"

And:

filter="url(#f1 #f2)"

But none of them work. How can I approach this problem?

Answer 1

Here's a below example I've been working on for a project, where I blend together 5 different layers in a single SVG. The code is slightly more tedious but it's reliable.

It's grouped into 2 darker layers, blended with a multiply mode, then 2 lighter layers blended with a screen mode.

The last filter then blends together these 2 filters using a soft-light mode, and then renders over the top of a grey base layer - useful for filling any blanks caused by opacity stops.

I have found this link very useful for determining the correct blend modes: https://oreillymedia.github.io/Using_SVG/guide/blend-modes.html or github link to the same resource is: https://github.com/oreillymedia/Using_SVG/blob/master/guide/blend-modes.html

<?xml version="1.0" standalone="yes" ?>
<!-- note: xmlns link is required to use namespaces later -->
<svg width="100px" height="100px" viewbox="0 0 100 100" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
    <defs>
        <!-- define 4 different radial filters -->
        <radialGradient
            id="grad1"
            cx="0.25"
            cy="0.25"
            r="0.5"
            fx="0.25"
            fy="0.25"
            spreadMethod="pad">
            <stop offset="0%" stop-color="#900000" />
            <stop offset="100%" stop-opacity="0.0" stop-color="#900000" />
        </radialGradient>
        <radialGradient
            id="grad2"
            cx="0.75"
            cy="0.25"
            r="0.5"
            fx="0.75"
            fy="0.25"
            spreadMethod="pad">
            <stop offset="0%" stop-color="#ffffff" />
            <stop offset="100%" stop-opacity="0.0" stop-color="#ffffff" />
        </radialGradient>
        <radialGradient
            id="grad3"
            cx="0.25"
            cy="0.75"
            r="0.5"
            fx="0.25"
            fy="0.75"
            spreadMethod="pad">
            <stop offset="0%" stop-color="#bfbfff" />
            <stop offset="100%" stop-opacity="0.0" stop-color="#bfbfff" />
        </radialGradient>
        <radialGradient
            id="grad4"
            cx="0.75"
            cy="0.75"
            r="0.5"
            fx="0.75"
            fy="0.75"
            spreadMethod="pad">
            <stop offset="0%" stop-color="#009000" />
            <stop offset="100%" stop-opacity="0.0" stop-color="#009000" />
        </radialGradient>
        
        <!-- define a base rectangle at 50% grey -->
        <rect id="rect-base" x="0" y="0" width="100" height="100" fill="#ff0000" />
        
        <!-- define 4 rectangles and apply above filters to each one -->
        <rect id="grad1-rect" x="0" y="0" width="100" height="100" fill="url(#grad1)"/>
        <rect id="grad2-rect" x="0" y="0" width="100" height="100" fill="url(#grad2)"/>
        <rect id="grad3-rect" x="0" y="0" width="100" height="100" fill="url(#grad3)"/>
        <rect id="grad4-rect" x="0" y="0" width="100" height="100" fill="url(#grad4)"/>

        <!-- define a filter which combines the two darker gradient filled rectangles -->
        <filter id="fil-dark" x="0%" y="0%" height="100%" width="100%">
            <feImage xlink:href="#grad1-rect" result="fil-1A" x="0" y="0" />
            <feImage xlink:href="#grad4-rect" result="fil-1B" x="0" y="0" />
            <feBlend in="fil-1A" in2="fil-1B" mode="multiply" result="blendedGrad1"/>
            <feComposite in="blendedGrad1" in2="SourceGraphic" operator="in"/>
        </filter>
        
        <!-- define a filter which combines the two lighter gradient filled rectangles -->
        <filter id="fil-light" x="0%" y="0%" height="100%" width="100%">
            <feImage xlink:href="#grad2-rect" result="fil-2A" x="0" y="0" />
            <feImage xlink:href="#grad3-rect" result="fil-2B" x="0" y="0" />
            <feBlend in="fil-2A" in2="fil-2B" mode="screen" result="blendedGrad2"/>
            <feComposite in="blendedGrad2" in2="SourceGraphic" operator="in"/>
        </filter>
        
        <!-- define 2 rectangles that are filled with the light and dark filter results -->
        <rect id="filter1-rect" filter="url(#fil-dark)" x="0" y="0" width="100" height="100"/>
        <rect id="filter2-rect" filter="url(#fil-light)" x="0" y="0" width="100" height="100"/>
        
        <!-- define a final filter which combines the two rectangles which each contain the result of another filter -->
        <filter id="fil-blend" x="0%" y="0%" height="100%" width="100%">
            <feImage xlink:href="#filter1-rect" result="fil-3A" x="0" y="0" />
            <feImage xlink:href="#filter2-rect" result="fil-3B" x="0" y="0" />
            <feBlend in="fil-3A" in2="fil-3B" mode="soft-light" result="blendedGrad3"/>
            <feComposite in="blendedGrad3" in2="SourceGraphic" operator="in"/>
        </filter>
        
    </defs>
    
    <!-- create a base layer rectangle filled with 50% grey -->
    <rect x="0" y="0" width="100" height="100" fill="#7f7f7f"/>
    <!-- add a second rectangle on top filled with the final filter result -->
    <rect filter="url(#fil-blend)" x="0" y="0" width="100" height="100"/>
</svg>

Took me a bit of working out so hopefully it might be useful to someone else.

Answer 2

I know this is a very old question, but for people referencing this, you can also just separate your filter functions with spaces - filter="url(#f1) url(#f2)" should work

See: https://css-tricks.com/almanac/properties/f/filter/

Answer 3

You could add multiple effects in one filter, however if you want to stack the filters up, first group the object and then apply the other filter to your object.

<g filter="url(#f2)">
<rect width="90" height="90" stroke="green" stroke-width="3" fill="yellow" filter="url(#f1)"/>
</g>

Answer 4

Start with an identity feColorMatrix and name the result currentGraphic for example. Use that as 'in' for each filter element bundle/transaction start and as 'result' for the final operation of the bundle. The next element bundle picks it up at 'in'='currentGraphic', etc.