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— Track One Frame Backwards: Tracks one frame backwards and stops. Useful if you’re tracking frame by frame to watch the progress of a particularly complicated bit of motion.
If something goes wrong, you can back up to the last frame where the stroke was able to properly track the subject, and drag the stroke to a better location using the pointer to make it follow the subject properly. If necessary, you can go a frame at a time, dragging the stroke to a better position every time it fails to follow the feature you’re using it to isolate.
— Track All Frames Backwards: Continuously tracks from the current frame all the way to the beginning of the clip.
— Stop Tracking: Stops tracking, in cases where there’s a problem with the track and you want to make a change.
— Track Forwards and Backwards: Tracks from the current frame all the way to the end of the clip, then returns to the original tracking point and tracks backwards to the beginning of the clip.
— Track All Frames Forwards: Continuously tracks from the current frame all the way to the end of the clip.
— Track One Frame Forwards: Tracks one frame forward and stops. Useful if you’re tracking frame by frame to watch the progress of a particularly complicated bit of motion. If necessary, you can go a frame at a time, dragging the stroke to a better position every time it fails to follow the feature you’re using it to isolate.
— Go To Last Frame of Tracked Area: Moves the playhead to the last tracked frame of a range of tracked frames in preparation for tracking forwards if there are untracked frames at the end of the clip.
— Stroke tools: Two tools at the right let you choose whether to draw strokes to identify the feature you want to isolate or identify things that aren’t the feature in order to eliminate unwanted excursions in the resulting mask. The plus eyedropper adds an area to the mask; the minus eyedropper removes an area from the mask.
— Invert Mask: A button lets you invert the resulting mask in cases where you want to use the feature analysis of this palette to isolate everything except the feature or features being analyzed.
— Mask Overlay: Turns on an onion-skinned overlay with which to see what parts of the image are being masked alongside which aren’t, so you can continue to refine the result by adding, moving, or deleting strokes. The isolated part of the mask is tinted translucent red.
Stroke List
Once you start drawing strokes to identify features for mask generation, they appear in this Stroke list.
— Stroke list header: The header, at the left of the Stroke list, has controls for selecting, enabling/disabling, and naming each stroke (if you need that level of organization). Right-clicking any stroke in its header reveals controls to Reset Tracking Data and change the mask type (feature or not feature).
— In Object mode, this is just a flat list of strokes, each of which help to either define the object you want to isolate, or the background.
— In Person mode, this is just a flat list of strokes, each of which help to either define the person you want to isolate, or the background.
— In Features mode, an additional drop-down menu lets you choose which specific feature you want to identify with a guidance stroke. All strokes are sorted hierarchically by the feature they correspond to, so for example each Face stroke appears underneath a Face title bar.