Adobe After Effects - Manual (Page 242)

Analyze buttons
Note:
Reset
Apply
Track Name
Tracker Plug-in
Channel
Process Before Match
Note:
Track Fields
Subpixel Positioning
Adapt Feature On Every Frame
If Confidence Is Below
Note:
Begins the frame-to-frame analysis of the track point in the source footage:
Analyze 1 Frame Backward : Analyze the current frame by moving back to the previous frame.
Analyze Backward : Analyze from the current-time indicator backward to the beginning of the trimmed layer duration.
Analyze Forward : Analyze from the current-time indicator to the end of the trimmed layer duration.
Analyze 1 Frame Forward : Analyze the current frame by advancing to the next frame.
While analysis is in progress, the Analyze Backward and Analyze Forward buttons change to a Stop button, with which you can stop
analysis when the track drifts or otherwise fails.
Restores the feature region, search region, and attach point to their default positions and deletes the tracking data from the currently
selected track. Tracker control settings and keyframes already applied to the target layer remain unchanged.
Sends the tracking data (in the form of keyframes) to the target layer or effect control point.
Motion tracking options
These settings apply to a tracker, a group of track points that is generated in one tracking session. You can modify these settings by clicking
Options in the Tracker panel.
The name for a tracker. You can also rename a tracker by selecting it in the Timeline panel and pressing Enter on the main
keyboard (Windows) or Return (Mac OS).
The plug-in used to perform motion tracking for this tracker. By default, this option displays Built-in, the only tracking plug-in
included with After Effects.
The components of the image data to use for comparison when searching for a match for the feature region. Select RGB if the tracked
feature is a distinct color. Select Luminance if the tracked feature has a different brightness than the surrounding image (such as a burning candle
carried through a room). Select Saturation if the tracked feature has a high concentration of color, surrounded by variations of the same color (such
as a bright red scarf against a brick wall).
Temporarily blurs or sharpens an image to improve tracking. Blur reduces noise in the footage. Usually a value of 2 to 3
pixels is enough to produce better tracks in grainy or noisy footage. Enhance exaggerates or refines the edges of an image and makes them
easier to track.
After Effects blurs or enhances the layer only for tracking. This blurring does not affect the motion source layer.
Temporarily doubles the frame rate of the composition and interpolates each field to a full frame to track motion in both fields of
interlaced video.
When selected, keyframes are generated to a precision of a fraction of a pixel. When deselected, the tracker rounds off
values to the nearest pixel for generated keyframes.
Causes After Effects to adapt the tracked feature for each frame. The image data that is searched for within the
search region is the image data that was within the feature region in the previous frame, rather than the image data that was in the feature region
at the beginning of analysis.
Specifies the action to perform when the Confidence property value is below the percentage value that you specify.
To determine an acceptable confidence threshold, track the motion and then examine the Confidence values for the track point in the
Timeline panel for problematic frames. Specify a confidence value that is slightly larger than the largest confidence value for the problematic
frames.
Select Continue Tracking to ignore the Confidence value. This behavior is the default behavior.
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