After applying sprayed stroke effect, the stroke is not transparent?

[PONGPOL]

I want to know there is any way to make the strokes transparent after applying the sprayed stroke effect in Ai?

As you can see the blue rantangle below, the stroke is white background not transparent.

[Monika Gause]

If it doesn't work with the transparent setting in Effect > Document raster effect settings, then it doesn't work.

In that case you can only create a second object (in black), apply the effect  ot it and use it as an opacity mask on the other object.

[PONGPOL]

Opacity mask doesn't work. Thank you.

[rcraighead]

"Opacity mask doesn't work. Thank you."

Can you be more specific? What is it doing? Did you try clicking "Clip" or "Invert Mask"? 

[rcraighead]

Use your "Sprayed Stroke" effected object as a Transparency mask (set color to black) and have it mask whatever you like.

[PONGPOL]

Thank you so much.

[meganchi]

With sprayed stroke object selected, go to Object, expand appearance. Then choose, Object, Rasterize.

Next, perform a trace, and under advanced image trace options, select "ignore white". Then click Expand.  This allows you to have editable vector.

[SJRiegel]

"Opacity mask doesn't work. Thank you."

Take another look -- what is going wrong when you try it?

[PONGPOL]

Thank you very much.