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Photoshop Tutorial: Radial Starburst Effect
Starbursts are easy to create in Photoshop. Here is a step-by-step tutorial on how to create radial starbursts.
Step 1: Create a new image about 1000 x 375 pixels. Make a vertical 20 px wide black line at the edge, duplicate that layer and set it next to the other black line and change the colour to white.
Duplicate these shapes alternating black and white until you reach the other side with the colour opposite to what you started with. If you are close to the opposite edge and have some space left, select all black and white shape layers, press Ctrl+T and stretch the shapes to the other side. Double-click to apply the transformation.
Step 2: Select all black and white shapes and press Ctrl+E to merge layers. Click Filter > Distort > Polar Coordinates and check “Rectangular to Polar” as shown below.
Step 3: Cut and paste this image into your main file such as your masthead, poster, or whatever graphic you are working on. In this case, I pasted the image into a masthead I'm working on, underneath a few layers.
Change the starburst layer blending mode to “Overlay” and reduce the transparency to about 32%.
Step 4: Select the starburst layer and apply a layer mask. Select the Gradient Tool  and choose the radial gradient.
Next, select the layer mask thumbnail that you just created, as shown in the box below.
With the layer mask thumbnail still highlighted, create a radial gradient starting from the centre of the starburst and radiating outward. You may need to check the box at the top next to “reverse” (see above) for the proper effect. Play around a bit with the gradient and settings until you get the result you want.
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