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Chapter 14. Station ID > Creating an Aperture

Creating an Aperture

The city background is viewed through an aperture you'll create by masking two solid layers. You have a lot of freedom to make your aperture unique when you draw and position your masks; use our illustrations and masking instructions as a general guide. The solids' appearance is created with the Ramp and Bevel Alpha effects:

1.
At time 0;00, create a comp-size Solid layer named Border 2 that's any color. Make sure the Solid layer is above the other layers in the Timeline.

2.
Use the Elliptical Mask tool on the Solid layer to draw an oval shape that encompasses about two thirds of the composition. The right side of the mask in this chapter's final movie is within the composition, and the left side is out of view to the left of the composition. Use the illustration of the first iris as a guide.

3.
Set the Mask's Mode to Subtract so you see the city through the oval shape.

Tip

Choose Layer > Mask > Free Transform Points after you select your mask in the Timeline to more easily move, rotate, and reshape your mask.

Making the first aperture

4.
Still at time 0;00, add a Mask Shape keyframe to the Border 2 layer's mask.

5.
Press End on your keyboard to go to time 4;29. Rotate and move the mask's shape up or down to a new location near the mask's current location, to create a slow and subtle movement.

Note

Make sure you move only the mask and not the Solid layer.

6.
To create the second half of the iris, duplicate the Border 2 layer and rename the new layer Border 1.

7.
At time 0;00, move the Border 1 mask so it encompasses the area opposite the Border 2 layer's mask. In this chapter's final movie, the left edge of the mask is within the composition, and the right edge is out of view on the right side.

8.
At time 4:29, rotate and move the Border 1 mask up or down in the opposite direction of Border 2's mask.

The masked solids create a basic frame over the city scene.


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