Adjusting the Onscreen Trackers

The Analyze Motion, Stabilize, and Match Move behaviors share common onscreen and Inspector controls.

A tracker consists of a single onscreen control: the tracker.

Figure. Canvas window showing tracker.

The default onscreen tracker color is red. Depending on the color of your subject, you may need to change the color of the tracker to see the tracker in the Canvas.

Once the tracking analysis begins, a progress window opens and track points appear in the Canvas. The track points are the post-analysis motion path (the path that looks like a string of pearls) that appears in the Canvas. The track point at the current playhead position is emphasized.

Note: Track points in the Canvas correspond to the tracking keyframes that appear in the Keyframe Editor.

To position the tracker
  1. Drag the tracker in the Canvas.

    As you drag, the area around the tracker in the Canvas is magnified and its position is displayed in an info window. This area is a visual aid for positioning the tracker and does not represent a search area or region.

    Figure. Canvas window showing magnified inset that appears when a tracker is dragged.

    Note: Unlike many correlation trackers, you do not manually specify a search area when setting up a tracker in Motion. Motion automatically searches, with subpixel accuracy, a default area around the track point.

    The Behaviors tab of the Inspector includes a Tracker Preview area that updates as you drag the tracker in the Canvas.

  2. Fine-tune the tracker position by doing one of the following:

    • Drag in the Tracker Preview area

      As you drag in the preview area, the tracker in the Canvas also updates.

      Figure. Behaviors tab showing Tracker Preview control.

      If you are using rotated footage, the rotation is not reflected in the Tracker Preview in the Inspector. The rotation is reflected in the magnified visual aid in the Canvas.

    • Click the tracker’s disclosure triangle in the Behaviors tab of the Inspector, and use the Position controls to numerically adjust the tracker’s position.

      Note: You can Option–drag in the Tracker Preview area to manually override the pattern search size. Option–drag left to reduce the size of the search pattern in the Canvas, and Option–drag right to increase the pattern search size. Alternatively, you can modify the search size using the Track Size slider in the tracker parameters.

To move multiple trackers at the same time
  • Drag to select or Shift-select the trackers in the Canvas, then drag them to a new position.

    A selected tracker appears yellow.

    Note: Because you risk moving the onscreen trackers when Shift-selecting, dragging to select may be a better option.

To turn off the onscreen trackers
Do one of the following:
  • Control-click a tracker in the Canvas, then choose Hide Selected Tracker from the shortcut menu.

  • Deselect the appropriate Track checkbox in the Behaviors tab of the Inspector.

    Once the tracker is turned off, it is not used in the analysis.

To turn on the onscreen trackers
  • Select the appropriate Track checkbox in the Behaviors tab of the Inspector.

To change the color of the onscreen tracker
  1. Select the tracker and click the Behaviors tab in the Inspector.

  2. Click the trackers disclosure triangle and use the Color controls to change the color of the tracker.

    Figure. Inspector showing tracker Color controls.