Using SVG Mask to enhance shape Fill

I am having trouble achieving the desired effect of darkening the fill of objects based on a specified gradient. Instead, when the mask is applied over the fill, it actually lightens it. I suspect that this issue arises from the color blending method being additive rather than subtractive. Is there a need for an additional filter to be applied on top of the mask? It seems like there should be a way, either in the gradient or mask definitions, to control how the colors blend. You can find the code and fiddle link below:

<svg width="400px" height="500px">
  <defs>
    <linearGradient id="mygradient" gradientUnits="userSpaceOnUse"
                    x1="0" y1="0" x2="0" y2="100%">
      <stop offset="0" stop-color="black"/>
      <stop offset="0.5" stop-color="white"/>                
      <stop offset="1" stop-color="black"/>
    </linearGradient>

      <mask id="mask1" x="0" y="0" width="400" height="500" MaskUnits="userSpaceOnUse" color-interpolation="sRGB">
    <rect x="0" y="0" width="400" height="500"
        style="stroke:none; fill: url(#mygradient)"/>
  </mask>
  </defs>



  <g fill="red" mask= "url(#mask1)" stroke="black" stroke-width="4"
    feblend="Multiply">

    <rect x="5" y="5" width="390" height="90"/>
    <rect x="5" y="105" width="390" height="90"/>
    <rect x="5" y="205" width="390" height="90"/>
    <rect x="5" y="305" width="390" height="90"/>
     <rect x="5" y="405" width="390" height="90"/>

  </g>

</svg>

https://jsfiddle.net/6q3x8x5u/

javascriptcsssvg

Answer №1

You have the option to swap out the mask by using a basic <rect> along with the appropriate blend mode.

(Just after the <g>):

<rect x="0" y="0" width="500" height="600" style="stroke:none;
  fill: url(#mygradient); mix-blend-mode: overlay" />

To view an example, check out this sandbox

Answer №2

Wondering about the purpose of the mask? Masks are actually used to adjust transparency, not color.

Your SVG contains a gradient that is currently unused. By modifying the colors of the gradient, you can achieve the desired effect.

<svg width="400px" height="500px">
  <defs>
    <linearGradient id="mygradient" gradientUnits="userSpaceOnUse"
                    x1="0" y1="0" x2="0" y2="100%">
      <stop offset="0" stop-color="black"/>
      <stop offset="0.5" stop-color="red"/>                
      <stop offset="1" stop-color="black"/>
    </linearGradient>
  </defs>
  
  
  
  <g fill="url(#mygradient)" stroke="black" stroke-width="4"
    feblend="Multiply">

    <rect x="5" y="5" width="390" height="90"/>
    <rect x="5" y="105" width="390" height="90"/>
    <rect x="5" y="205" width="390" height="90"/>
    <rect x="5" y="305" width="390" height="90"/>
     <rect x="5" y="405" width="390" height="90"/>

  </g>

</svg>

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