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How do I add the Turbulence filter to an ellipse in inkscape? I create an ellipse shape.

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I select the ellipse and go to the Filter Editor. I create a new filter and add the turbulence filter and enable the filter. Instead of giving me an ellipse with turbulence I just see a rectangle with turbulence.

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By contrast if I use a Gaussian Blur it appears to give my ellipse a blur as desired.

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Why does this happen and how can I fill an ellipse with the turbulence pattern?

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Two possible ways are the following (there may be others):

1. By using clipping

  • draw your ellipse
  • duplicate it (Ctrl+D)
  • move your duplicate to another layer (optional, for convenience only), which you hide for the moment
  • apply turbulence filter to original ellipse
  • unhide the duplicate ellipse, select the original ellipse (now with turbulence filter applied and looking like a rectangle) and the duplicate ellipse together, and do Object > Clip > Set.

(General information on clipping in Inkscape.)

2. By adding a "composite" effect to the filter

  • in Filter editor, first add turbulence effect (as mentioned in the question)
  • then add a "composite" effect. The composite effect has two entries: one should be the output of the turbulence effect, the other should be the source graphic. In "Effect parameters", set "operator" to "In" (see screenshot below).

Screenshot of filter editor with turbulence and composite effect

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