Apple Motion 2 Getting Started User Manual download pdf (Page 157)

Chapter 5 Extra Credit 157

To remove additional “garbage” from a key, set any additional masks to Subtract mode.

Once the masks are applied, the grass (the white portion of the matte) that was left by

the keying filter is removed from the alpha channel of the elephant image.

Editing Mask and Shape Control Points

Use the following guidelines to edit mask and shape control points.

To move a control point:

In the Canvas, drag the point.

To add a control point:

Press Option, then position the pointer over the area of the mask or shape edge in

which you want to add the point, then click. You can also double-click the edge to add

a control point.

To remove a control point:

Select the point, then press Delete (or Control-click, then choose Delete Point from the

shortcut menu).

To create tangent handles, do one of the following:

While drawing the shape, drag as you add control points.

To create handles after a shape is drawn, press Command and drag the control point

outward.

To break tangent handles:

Press Command, then drag the end of a handle.

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Apple Motion 2 Getting Started User Manual Page 157