Apple Motion 2 Betriebsanweisung PDF herunterladen (Seite 8)

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Working with the Motion Tracker Parameter Group

The Motion Tracker parameter group allows you to track the motion of an object in a media Þle. You can then use the

motion path data to control another aspect of the effect. The parameters that can be affected depend upon the Þlter. For

example, apply a Pyramid Blur Þlter to a clip and use the Motion Tracker parameters to track a logo on a t-shirt. Use

the PixelChooser parameters to apply the Pyramid Blur to obscure the logo.

The Motion Tracker parameter group is included in many Þlters that include the PixelChooser parameter group. This

allows you to apply the Þlter to an area using a shape choice in the PixelChooser Region parameter group’s Shape

menu.

Due to a problem in the Apple Motion plug-in architecture, Version 1.0 does not support the Motion Tracker.

If you attempt to use the Motion Tracker, an error message displays. You must use Motion Version 1.01 to use

the Motion Tracker.

The Wire Remover Þlter includes two Motion Tracker parameter groups so that you can track both ends of the wire that

you want to remove. The Witness Protection Þlter allows you to apply a mosaic, blur, tint or brightness/contrast effect

to the speciÞed area.

The Light Zoom, Rays Light Þlters and the Lens Flare Þlters also include a Motion Tracker parameter group. This allows

you to track the Light Source, with one exception. In the case of the Radiant Spotlight, the Spotlight Target is tracked.

The Twirl, Radial Blur, and Spiral Blur Þlters also include a center option. This allows you to track the center point of

the effect.

Presets do not save Motion Tracker data. If you open a new preset, motion tracking data saved with it will be

lost. Loading a preset will overwrite existing motion tracker data.

The Motion Tracker parameter group includes the following controls.

Selecting the

Reset button

resets the parameters in the Motion Tracker parameter group.

If you reset the Motion Tracker, BCC must recompute the entire track, which could take time on a long clip

with a large search region.

Pressing the

Help button

opens a .pdf format help Þle that is speciÞc to your host.

We strongly recommend you reference the online Motion Tracker .pdf help Þles when you use the Motion

Tracker. The help Þles offer in-depth tips on using the Motion Tracker in your speciÞc host.

The

Tracking Source Layer

sets the layer to track, which may be different from the source of the Þlter.

When the

Track On-the-Fly checkbox

is selected and you press

Play

, the Þlter calculates the tracking data. When you

select this checkbox, the chosen effect does not display. Once you Þnish tracking, deselect this checkbox to play the

applied effect.

The

Tracker Center KF

position controls set up the area to track. However, in general it is easier to use the onscreen point

controls. Then use the position controls for Þnetuning.

Target Width

sets the size of the area to track. Increasing this value increases preview time but can increase the accuracy

of the tracking. A white outline indicates the selected area.

The

Apply menu

determines the parameter that the Motion Tracker data affects. The choices depend on the Þlter.

• When None is chosen, the Motion Tracker data has no affect.

• In many Þlters that include the PixelChooser, choosing PixelChooser allows you to use a choice in the PixelChooser

Region’s Shape menu to track the Þlter within the speciÞed area. You must explicitly set the

Shape menu

to one of

the following choices: Inside Rectangle, Outside Rectangle, Inside Oval, Outside Oval, Distance to Point, Clock

Wipe, Linear Gradient, or Custom. The Motion Tracker does not work with Distance to Edge. The point speciÞed

by the

Point 1

position controls is tracked.

• In the Lens Flare, Lens Flare Advanced and Rays Light suite Þlters, choosing Light Source tracks the source of the

light.

• In the Rays Radiant Spotlight, choosing Spotlight Target tracks the target of the spotlight.

• In the Wire Remover Þlter, choosing End Point 1 or End Point 2 tracks the corresponding end point. Alternatively,

you can choose PixelChooser.

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