Apple Shake 4 - Manual (Page 725)

Chapter 25 Image Tracking, Stabilization, and SmoothCam 725
Next to each track name is a Color Picker and a Visibility button.
To change the color of a tracker, click the color swatch.
Tracking Parameters
All trackers share the following parameters:
Track Display Click to toggle between track display options:
• The left button displays all trackers, curves, and
keyframes.
• The middle button displays just the trackers and
keyframes.
• The right button displays just the trackers.
You can also control visibility of individual trackers
as described below.
FG/BG These buttons appear on the Viewer shelf when
the MatchMove node is active. Click FG/BG to
toggle between adjusting the track points on the
background (BG), or the corners of the foreground
(FG) that are pinned to the track points (when “4
pt” [four-point tracking] is enabled in the trackType
parameter).
Button Description
Parameter Description
trackRange The trackRange parameter is the potential frame range limit of your track. By
default, the range is set to the clip range. For generated elements such as
RGrad, the default takes a range of 1. You can set new limits using Shake’s
standard range description, for example, 10-30x2. If you stop tracking and start
again, processing starts from the current frame and proceeds to the lower or
upper limit of your trackRange (depending on whether you are tracking
forward or backward).
subPixelResolution The subPixelResolution parameter determines the resolution of your track. The
smaller the number, the more precise the track.
Possible values:
1 Area is sampled at every pixel. Not very accurate or
smooth, but very fast.
1/4 Area is sampled at every .25 pixels (16 times more than
with a sampling of 1).
1/16 Area is sampled at every .0625 pixels (256 times more
than with a sampling of 1).
1/32 Area is sampled at every .03125 pixels (1024 times more
than with a sampling of 1).
1/64 Area is sampled at every .015625 pixels (4096 times more
than with a sampling of 1).