Apple Motion 2 Getting Started User Manual download pdf (Page 154)

154 Chapter 5 Extra Credit

Note: In the Primatte RT filter, the Matte Density and Spill Suppression values cannot

be set to a value lower than Noise Removal.

Since the grass in the blue screen image is nearly the same color as the subject, it is

not keyed out. To remove the grass in the lower portion of the foreground image,

use a mask. This is discussed in the following section.

For more information on the keying filters, see Chapter 9, “Using Filters” in Motion Help.

Masking Layers and Objects

Masks are used to define a specific shape for a transparent area of an object. For

example, you can use a mask to cut out a particular element from a shot, such as a

cartoon character, and place the cut-out character above another layer in your project.

Or, you can use text as a mask for an image or moving footage, so that the text object

is filled with the image it is masking. Masks are also used to remove lights or other rigs

from a shot (this is known as a holdout mask), or to remove rough portions of the key,

often referred to as “dirt” (this is known as a garbage mask).

There are two ways to mask an object or layer in Motion. The first method is to draw a

mask directly on the object you want to mask. The second method is to add an image

mask to an object, then drag an object (an image, shape, text object, and so on) to the

image mask. You can use any image, shape, or text object as an image mask source, as

well as select a specific channel of the source image to use for the mask. The following

examples briefly describe each method.

Note: Although you use different tools to draw masks and shapes, the controls for

drawing and editing shapes and masks are identical. Once drawn, masks and shapes

have different parameter sets.

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Apple Motion 2 Getting Started User Manual Page 154