Example:
First, save the image below which we'll use for this lesson.
Step 2
Create a new flash 
Step 3
Call the current layer image. Double-click on its default name (Layer 1) to change it. Press Enter once you have typed in the new name!
Step 4
Choose now File > Import > Import to stage (Ctrl+R) and import the image that you just saved in step 1 into a flash stage. While the image is still selected, hit F8 key (Convert to Symbol) to convert it into a Movie Clip Symbol.
Step 5
While the new made Movie Clip (photo) is still selected, go to the Align Panel (Ctrl+K) and do the following:
1. Make sure that the Align/Distribute to Stage button is turned on,
2. Click on the Align horizontal center button and
3. Click the Align vertical center button.
Step 6
Click now on frame 25 and 45 and hit F6 key. Go back now on the first frame, select the Selection Tool (V) and click once on the image to select it.Then, go to the Properties Panel (Ctrl+F3) below the stage. On the right, you will see the Color menu. Select Advanced in it, click on Settings button and make the adjustments as follow:
Step 7
Right-click anywhere on the gray area between frame 1 and 25 on the timeline and choose Create Motion Tween from the menu that appears.
Step 8
Create a new layer above the layer image and name it mask.
Step 9
Select the mask layer, take the Rectangle Tool (R) and draw a rectangle shape about 20x300 px and place it on the position like it is shown on the picture below!
Step 10
Click now on frame 25 and hit F6 key. While you're still on frame 25, select the Selection Tool (V) and do like it is shown on the picture below!
Step 11
Click now on frame 44 and hit again F6 key. While you're still on frame 44, select the Rectangle Too (R) again and draw a rectangle shape about 20x300 px on the position like it is shown on the picture below!
Step 12
After that, select the Selection Tool (V) and do like it is shown on the picture below!
Step 13
Select now the first frame of layer mask and go the Properties Panel (Ctrl+F3) below the stage. Then, for Tween choose Shape. See the picture below!
Do this also for frame 25.
Step 14
Select now mask layer and convert it to a mask by right-clicking on the mask layer and selecting Mask. See the picture below.
We're done now!
Test your Movie (Ctrl+Enter) and enjoy!
Download source file (.fla)
discuss this topic to forum
