
This tutorial will show you an easy way to fill up a layer with the sparks brush. This tutorial, although shown as a sig, is mainly to save time on larger pieces. You can use this tutorial for any brush really, I chose to examplify the sparks brush because of its versitility and popularity.
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First off, make sure Sparks is your selected brush.

Start with your image or layer that you wish to fill.
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Zoom all the way out.
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Go over the image using the free select tool.
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If you go over it enough, it will look something like this.
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Edit -> Stroke Selection
Make sure to click "Stroke with a paint tool."
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It should now look somewthing like this.
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Go over the emptier spots with the paintbrush and you're done.

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