Written by Steve Patterson. In this Photoshop Effects tutorial, we're going to look at how to add colorful streaks of light to a photo. You've probably seen these light streaks used in ads for everything from shampoo to cellphones, and in fact they were used most recently in a cool ad for a new cellphone from Sprint and Samsung. Creating them is as easy as drawing a path with Photoshop's Pen Tool and then stroking the path with a brush, with a couple of simple layer styles used to add the actual color and light effect. It's all fairly easy, but if you've never used the Pen Tool before or you're not sure how to draw paths, you might want to check out our Making Selections With The Pen Tool tutorial first, where I cover everything you need to know about drawing and editing paths with the Pen.

Here's the image I'll be working with in this tutorial:

And here's how it will look after adding our light streaks:

Let's get started!

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Step 1: Add A New Blank Layer

We're going to be adding our light streaks on their own separate layer, so the first thing we need to do is add a new blank layer to our document. To do that, click on the New Layer icon at the bottom of the Layers palette:

This adds a new blank layer, which Photoshop names "Layer 1", above our Background layer:

Step 2: Select The Pen Tool

As I mentioned at the beginning, we're going to create our light streaks by drawing paths and then stroking the paths with a brush. To draw paths, we need the Pen Tool, so select it from the Tools palette. You can also press the letter P to select it with the keyboard shortcut:

Step 3: Select The "Paths" Option In The Options Bar

Photoshop gives us three different things that we can do with the Pen Tool. We can use it to draw vector-based shapes, we can draw paths with it (which is what we want to do), and we can draw pixel-based shapes. We select between these three options by clicking on their icons up in the Options Bar at the top of the screen. You'll see three little square icons grouped together on the left side of the Options Bar. Click on the icon in the middle, which is the Paths option:

Step 4: Draw A Path Where You Want The First Light Streak To Appear

With the Pen Tool selected and the Paths option chosen in the Options Bar, we're ready to draw our first path. I want my light streaks to appear in the bottom half of the photo, somewhere around the woman's shoulders and neck area, so that's where I'll draw my first path. You'll want to add several curves to your path to make the light streak more interesting. I'll start by clicking somewhere in the bottom left corner of the image to add my first anchor point, then I'll drag out direction handles in the direction that I want my path to follow. Again, be sure to check out our Making Selections With The Pen Tool tutorial first if what I just said made no sense to you:

I'll continue drawing the rest of my first path by clicking and dragging a couple more times with the Pen Tool to add the rest of my path segments. I now have my first path running from left to right across the woman's shoulders and neck area:

Step 5: Select The Brush Tool

Now that we've drawn our first path, the next step is to stroke it with a brush. For that, we'll need Photoshop's Brush Tool, so select it from the Tools palette, or simply press the letter B on your keyboard:

Step 6: Select The "40 Sampled Tip" Brush

Photoshop comes with several brushes that would work well for our light streak effect, but after trying a few of them out, I've found one I like the best. To select it, we'll need to bring up the Brushes palette. There's a few different ways to bring up the Brushes palette, and one of them is to click on the Brushes palette toggle icon in the Options Bar at the top of the screen:

When the Brushes palette appears, click on the words Brush Tip Shape in the top left corner of the palette. Then, in the Brush tip selection area on the right, scroll down near the bottom of the list and select the 40 Sampled Tip brush. It just says "40" in the preview area, but if you have Tool Tips enabled in Photoshop's Preferences, you'll see the words "Sampled Tip" appear when you hover your mouse over the brush:

Step 7: Lower The "Spacing" Amount To 1%

Down at the bottom of the Brushes palette, directly above the brush preview area, you'll see the Spacing option. Whenever you paint with a brush in Photoshop, even though it usually appears as though you're painting one continuous stroke, what Photoshop is really doing is "stamping" the image over and over again with the brush tip. If the "stamps" are close enough together, they appear as a continuous stroke.

The Spacing option determines how far apart the stamps will appear, and by default, the option is set to 30% for our "40 Sampled Tip" brush. That's too much of a space for our effect. Use the slider bar to lower the Spacing amount all the way down to 1%. If you look at the brush preview area after lowering the Spacing amount to 1%, you'll see that the brush now appears as one continuous stroke:

Step 8: Set The Brush Size Control To "Pen Pressure"

If we were to stroke the path with our brush right now, the light streak effect wouldn't look very good because the brush would appear at the exact same size all along the path. We need the brush to taper off at both ends to create the illusion that the light streak is actually beginning at one end and ending at the other. For that, we'll need to tell Photoshop to simulate pen pressure for us, as if we were drawing with a pen tablet.

Click directly on the words Shape Dynamics on the left of the Brushes palette, directly below "Brush Tip Shape". Make sure you click directly on the words, not just in the checkbox to the left of the words. Clicking inside the checkbox will enable the Shape Dynamics options but won't allow us to change any of them. We need to click on the words themselves to get access to the options. Once you've clicked on the words, you'll see the Shape Dynamics options appear on the right of the palette. At the very top, you'll see the words "Size Jitter" with a slider bar, and directly below the slider bar is the Control option. This is where we get to decide how to control the size of our brush. We want Photoshop to simulate pen pressure, so select Pen Pressure from the Control drop-down menu:

Now, at the moment, all we've done is told Photoshop that we want to control the size of our brush according to pen pressure, but what if you don't actually have a pen tablet? If you don't have one connected to your computer, you'll see a little warning icon appear to the left of the word "Control" telling you that a pen tablet is required, but don't worry about it. In a moment, we're going to be telling Photoshop to simulate pen pressure for us, so for this effect, it makes no difference whether you have a pen tablet or not.

Step 9: Set Your Foreground Color To White

We have our brush ready to go. Now all we need to do is choose the color we want to paint with. We're going to want to paint with white, which means we need our Foreground color to be white. Press the letter D on your keyboard to make sure your Foreground and Background colors are reset to their defaults, with black as your Foreground color and white as your Background color. Then press the letter X to swap them, making white your Foreground color:

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Step 10: Save Your Path

We have our path, we have our brush, and we've set our Foreground color to white. We're ready to create our first light streak! Switch over to Photoshop's Paths palette, which you'll find grouped in with the Layers and Channels palettes. You'll see your path listed, which is currently named "Work Path", along with a preview of the path on the left, similar to how layers are shown in the Layers palette with their name on the right and a preview area on the left. Whenever you create a new path, Photoshop automatically names it "Work Path", which means it's temporary. If you don't save the path before drawing a new one, the new path will replace the previous one and you'll have lost it. In many cases, this isn't a problem, but let's save our path just in case we want to go back to it later.

To save a path, all we need to do is rename it. Simply double-click on the name "Work Path" and Photoshop will pop up the Save Path dialog box, with the suggested name of "Path 1" already entered for you. Click OK to exit out of the dialog box and Photoshop will rename the path "Path 1". The path is now saved: