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Stroking a Path with Gradients and Motion Blurs

Using the Stroke Path command in conjunction with tool options in Adobe Photoshop By Dave Nagel
A long time ago, I mentioned that I was looking for a way to simulate a motion blur in Photoshop. I don't mean just a simple motion blur like the one you find in the Filter menu. I mean a more versatile blur, one that would allow me to blur in multiple directions. In other words, a motion blur along a path. Well, I just might have found the answer. You decide.

This is not a particularly difficult tutorial. I actually stumbled upon this technique when answering a user question in the Adobe Photoshop forum here at Digital Media Net. The question was, "How do I stroke a path with a gradient?" I thought about it for a second, came up with the answer and then thought, "Wait a minute! This could be applied to blurring as well! Hot diggity!" (No, I don't actually think phrases like "hot diggity!" I'm just toning it down a bit for the fragile sensibilities of my bosses.)

Stroking a path with a gradient
For the gradient portion of this tutorial, it works like this.

1. Draw the path to be stroked. In the example above, I just drew a rough stroke with the Freeform Pen tool.

2. Select one of the painting tools in the Tool palette. Pick your brush, and then adjust the settings in the tool bar up at the top.

3. In the little brush icon in the toolbar, you'll see three options: Size, Pressure and Color. To create a color gradation, simply turn on "Fade" in the color option. This will transition the stroke from the foreground color to the background color over the course of the steps you set. (See note below.) To create a gradation that goes from a color to transparent, select Fade in the Pressure option. Again, this will transition the stroke from the foreground color to transparent over the number of steps you set. (You can also combine the two, along with size.)

4. Now, in the Path palette, click on the flyaway menu and select "Stroke Path." The default option will be your currently selected tool.

Voila! You now have a gradation along a path. Can you see where this is heading? That's right: Motion blur. But first a note.

NOTE: The most difficult part of this process is determining the proper number of "steps" for your gradation along any given path. In Photoshop, a "step" is simply an application of the selected brush. Brushes "step" according to the Spacing percentage set in the Brush Options dialog, which you can access by clicking on the brush icon in the tool bar.

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