Step 1. Create the image to which you want to apply a motion blur, and convert it to a graphic symbol

Step 2. Copy the graphic, and paste it into a new document in Photoshop.

The new Photoshop document should be in RGB and at 72-dpi resolution and the same size as your copied Flash graphic.

The Flash graphic appears in the Photoshop document.

Step 3.Choose Image > Canvas Size. The Canvas Size dialog box appears.

Step 4. Increase the canvas by about 150 percent in the direction in which you will be applying your motion blur

The background of your graphic increases so that you have room for your motion blur

Step 5. Choose Filter > Blur > Motion Blur. The Motion Blur dialog box appears.

Step 6.Change the angle of the blur to match the direction in which your image will be moving, and set the amount of blur to about one-fifth the overall size of your image


Step 7. Choose Layer > Flatten Image

8. Choose Select > All (Cmd-A for Mac, Ctrl-A for Windows), copy the image, and then paste it back into your Flash file in an empty layer.

9. Convert the blurry bitmap image to a graphic symbol.

10. Move the blurry instance below the original Flash graphic so that the streaks extend in the opposite direction from which the graphic will move

11.Create keyframes for both layers later in the Timeline, move both instances across the Stage, and apply a motion tween to both layers.
The original image and the blurred image move together, but the combined effect isn’t quite convincing yet.

12. Adjust the timing of the keyframes so that the blurred image starts a few frames later and the original image finishes a few frames earlier, and add an empty keyframe in the last frame for the blurred image