Apple Motion 2 Betriebsanweisung PDF herunterladen (Seite 9)

Using Boris Continuum Complete with Apple® Motion®

•

The

Offset X

and

Offset Y

parameters, allow you to offset the effect on the X and Y axis respectively. This is useful if you

want to track one area, then apply the effect to a different area. For example, you want to blur out an athlete’s name on

a t-shirt but don’t want to blur the player’s number. However, the player’s number offers more contrast and is therefore

easier to track. You would track the number, then offset the effect to obscure the name.

Setting Up your Effect

The Þrst step in motion tracking is to set up your tracker region in Track on the Fly mode. The process outlined below

differs slightly in each host. Refer to the online help Þle in the Motion Tracker section of each Þlter for steps you need

to follow in the host you are using. When you apply a Þlter that contains the Motion Tracker, press the Help button in

the Motion Tracker banner to open its help Þle.

The implementation of the Motion Tracker has speciÞc limitations in each host. Be sure to read the Motion

Tracker section for your speciÞc host.

Place the playhead on the Þrst frame of your effect.

Select the

Track on the Fly checkbox

At the Þrst frame, create a keyframe for the Tracker Center KF. This is important if the Tracker loses focus later in

the effect and you need to adjust it.

Use the onscreen Tracker Center control or type in the

Tracker Center KF

numerical Þelds to set the center of the

object you want to track.

Adjust the other Motion Tracking parameters as necessary, for example to set up the target region. See “Tips for

Setting Up the Target Area” for more information. A good Target region includes a high-contrast object with good

vertical and horizontal edge deÞnition. Set the Target Width large enough to accommodate a good Target object.

Click

Play

to track your effect.

If necessary, add additional keyframes later in the effect, for example if the Þlter loses the track. For details, see

“Adjusting Tracking with Hold Keyframes” on page 11.

You must render in the same session that you track. If you open a saved project that uses the tracker, you must

retrack.

Understanding Tracking on the Fly

When the

Track On-the-Fly checkbox

is selected and you click Play, the Þlter calculates the tracking data.

Understanding the Onscreen Tracking Marks

When Track on the Fly is enabled, a line along the bottom of the window indicates the location of tracked frames. The

line references either the length of the original source clip (AE, Combustion, Red) or the edited source clip in the

timeline (Motion, Final Cut Pro and Premiere Pro). It is important to note that this line is actually rendered onto the

image when in Track on the Fly mode. You must turn off Track on the Fly before you render to disk.

• A red mark along the bottom of the window indicates the position of the current-time indicator.

• Blue marks indicate keyframe locations. A keyframe location is any frame whose position differs from that of the

previous frame. A frame where the center position differs from the previous frame is also considered a keyframe.

The blue onscreen marks are internal to the Motion Tracker. While the Motion Tracker considers these frames

“keyframes,” these are different than the keyframes that are visible in your timeline.

• Green marks indicate tracked frames that are current (the location of the tracker center has not changed since the

tracking data was generated).

• Magenta marks indicates tracked frames for which the tracker center has changed. This usually indicates a region

that needs retracking (unless you are manually positioning the Tracker Center KF without making keyframes in

your timeline).

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