Description
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Step 8
Now we're going to apply the same process to create the other half of the star. Select the Lights layer and press Ctrl+J to duplicate the layer or open the Layer menu and select Duplicate Layer. Change the blending mode of the new layer to Screen.

Step 9
Now we'll apply the same Motion Blur filter but with the opposite angle. Open the Filter> Blur menu and select Motion Blur. In the Motion Blur window, simply change the angle value to a negative number by typing a "-" in front of the value and click OK.

Step 10
Press Ctrl+F or open the Filter menu and select the first listing: Motion Blur. Then, press Shift+Ctrl+L or open the Image> Adjustments menu and select Auto Levels to apply an Auto Levels. You should now see the effect of the star.
