User manual APPLE MOTION 3 SUPPLEMENTAL DOCUMENTATION

[. . . ] Motion 3 Supplemental Documentation K Apple Inc. Copyright © 2007 Apple Inc. Your rights to the software are governed by the accompanying software license agreement. The owner or authorized user of a valid copy of Final Cut Studio software may reproduce this publication for the purpose of learning to use such software. No part of this publication may be reproduced or transmitted for commercial purposes, such as selling copies of this publication or for providing paid for support services. [. . . ] In the following images, the foreground image is tracked to four points on the background clip, but still needs to be masked to fit into the picture frame (without unevenly scaling the image). Transformed and tracked foreground element Transformed and tracked element with applied mask Although the mask is attached to the foreground image, you may need to animate changes in the mask's position and scale to accommodate changes in the background clip over time. Note: As an alternative to using masks, you can also crop an object with applied tracking data using the Crop controls in the Properties tab of the Inspector. You can track the control points of a mask to a clip or apply existing tracking data to the control points of a mask. For more information, see "Track Points Workflow" on page 76. Chapter 2 Motion Tracking 69 Offset Four-Corner Pinning Depending on your source footage, you may need to corner-pin an element using reference points that are offset from the final "pinned" size of the foreground element. In the simple example below, the reference patterns to be tracked are located inside a frame, rather than at the corners. The orange visual aid (the orange outline) represents the resulting size of the corner-pinned image. The orange visual aids circle the tracking reference points. Because the track reference points are not flush with the inside edge of the frame, you must offset the image from the four trackers. Otherwise, the final corner-pinned image will appear too small. 70 Chapter 2 Motion Tracking The following example demonstrates how to offset the trackers without affecting the foreground image. To track reference points that are offset from the foreground image: 1 Use one of the workflows above to set up a four-corner pin using the Match Move behavior. 2 Choose Mimic Source from the Transform pop-up menu in the Behaviors tab of the Inspector. 3 In the Canvas, drag the trackers to the offset reference points. The image is not affected and remains locked to its original placement. 4 Click the Analyze button in the HUD or Behaviors tab of the Inspector. The foreground element is "pinned" on the background element. Using a Non-Match Move Four-Point Track for Corner-Pinning This section discusses an additional four-corner pin workflow that references a fourpoint track from an Analyze Motion behavior. Note: You can also perform this workflow using the Stabilize behavior. Chapter 2 Motion Tracking 71 To record four-point tracking using Analyze Motion: 1 Go to the frame where you want to start the track and apply an Analyze Motion behavior to the background element. For four-point Analyze Motion and Stabilize operations, the trackers should be positioned in a clockwise order, starting in the upper-left corner. This ensures the proper alignment of your element when the transformation is applied. Track 1 Track 2 Track 3 Track 4 2 Drag the tracker (Track 1) to the desired reference pattern in the top-left corner of the background element. 3 In the Behavior tab of the Inspector, click Add to add a second tracker, then drag the second tracker (Track 2) to the desired reference pattern in the top-right corner of the background element. 4 Add another tracker (Track 3) and drag it to the desired reference pattern in the bottom-right corner of the background element. 5 Add another tracker (Track 4) and drag it to the reference pattern in the bottom-left corner of the background element. 6 Click the Analyze button in the HUD or Behaviors tab of the Inspector. To apply the recorded four-point tracking to a foreground element: 1 Apply a Match Move behavior to the foreground element you want to corner-pin. 2 If the Analyze Motion data is not automatically applied, choose the existing four-point Analyze Motion track from the tracking behaviors pop-up menu. 3 Choose Four Corners from the Type pop-up menu in the HUD or Behaviors tab of the Inspector. 4 Click the Analyze button in the HUD or Behaviors tab of the Inspector. The four-point tracking data from the Analyze Motion behavior is applied to the foreground element. 72 Chapter 2 Motion Tracking Note: When using the Match Move behavior for four-point tracking, the trackers are automatically placed in the correct order in the Canvas after Four Corner is chosen from the Type pop-up menu in the Behaviors tab of the Inspector. Stabilize Workflow This section provides a general overview of using the Stabilize tracking behavior to stabilize a movie or image sequence. [. . . ] In the Analyze Motion and Stabilize behaviors, the trackers in this list are called "Track 1, Track 2, " and so on. In the Match Move behavior, the trackers are referred to as "Anchor" and "Rotation-Scale. " When fourpoint tracking is enabled, the trackers are called "Top Left, " "Top Right, " "Bottom Right, " and "Bottom Left. " To disable a tracker, turn off its checkbox. Click the disclosure triangle next to the track name to reveal additional parameters: Â Position: Displays the X and Y positions of the tracker. The X position is the value slider on the left; the Y position is the value slider on the right. [. . . ]