2009
Working with the Tracker Gizmos
There are several ways to work with gizmos in the Movie window.
■ Selecting: You need to select a gizmo to work on it. You do this by clicking
anywhere inside its bounds in the Movie window or by clicking its entry
in the tracker list box in the Motion trackers rollout. The selected gizmo
displays positioning handles at the corners of both its bounds boxes. You
can also select a gizmo by typing its number on the keyboard. A selected
gizmo has click-selection priority in the Movie window. If several gizmos
overlap, they make it hard to select and adjust the gizmo you want. You
can select it first in the Motion Trackers rollout list; it remains selected for
adjustment when you click it in the Movie window.
■ Zooming: You can zoom in and out on the selected gizmo by pressing the
I and O keys, for “in” and “out,” respectively. Each time you press I or O,
the window zooms in or out by a factor of 2 and centers the selected gizmo
in the window. Pressing R resets the zoom factor to 100 percent whether
you have a gizmo selected or not. The Movie window has to be the active
window for any keyboard commands to work. You can make it active by
clicking it.
■ Tabbing: You can move among successively numbered gizmos by pressing
the Tab key. If the gizmo you’re searching for is out of view, because you’re
zoomed in, the image will be repositioned in the window to bring the
newly selected gizmo into view. Tabbing while you’re zoomed in provides
a quick way to step through the gizmos to check their fine positioning.
■ Positioning: You can reposition a gizmo by dragging anywhere within its
bounding boxes, providing you don't click one of the eight box-corner
handles. You can nudge a gizmo in single increments by pressing one of
the arrow keys on the keyboard. The minimum increment that a gizmo
will move depends on the zoom factor and the subpixel-tracking level.
The increment is the smaller of either a single screen pixel in the current
window or the subpixel increment selected. So, if you’re zoomed out two
times and the subpixel increment is 1/16 of a pixel, the nudge increment
is four image pixels, due to the zoom. However, if you’re zoomed in five
times, the nudge increment is 1/16 of an image pixel, due to the subpixel
level.
■ Bounds: You adjust the bounding boxes by pressing and dragging the
handles of the box you want to adjust in the selected gizmo. Dragging the
handles of the inner feature bounds box adjusts the opposite corner
symmetrically to keep the gizmo center fixed.
Camera Tracker Utility | 3829