Apple Shake 4 User Manual
Page 746
746
Chapter 25
Image Tracking, Stabilization, and SmoothCam
inverseTransform
Inverts the transformation. Use this to “unstabilize” the shot. For example, you stabilize
a shot with a Stabilize, apply compositing operations, and then copy the first Stabilize to
the end of the node tree. By inverting the transformation, you return the shot to its
former unstable condition.
trackType
You can do one-point, two-point, or four-point matchmoves. Different options appear
with the different types.
•
1 pt: Pans the foreground element to match the tracking point. You can optionally
turn off the X or Y movement.
•
2 pt: Opens two additional parameters, with the option to match scaling and
rotation of the background element (with the matchScale and matchRotate
parameters).
•
4 pt: Performs cornerpin matchmoving on the foreground element. The pan, scale,
and angle parameters disappear. Four track points are used to make the
transformation.
applyX
Turning off the applyX parameter prevents the foreground element from following the
horizontal movement of the tracked subject.
applyY
Turning off the applyY parameter prevents the foreground element from following the
vertical movement of the tracked subject.
transform parameters
This section contains subparameters that control how the input image is transformed
according to the derived tracking information.
•
xFilter, yFilter: A pop-up menu that sets the transformation filter used. Different filters
can be used for horizontal and vertical transformations. For more information on the
different kinds of filters that are available and how they work, see “
•
transformationOrder: A pop-up menu that sets the order that transformations are
executed. The default setting is trsx. This means that transformations are performed
in the following order: translate, rotate, scale, shear.
•
motionBlur: Enables the motion blur for the foreground element. A value of 0 is no
blur; 1 is the high setting. A mid-value is a trade-off between speed and quality. This
value is multiplied by the motionBlur parameter in the Parameters tab.
•
shutterTiming: A subparameter of motionBlur. Controls shutter length. 0 is no blur,
whereas 1 represents a whole frame of blur. Note that standard camera blur is 180
degrees, or a value of .5. This value is multiplied by the global shutterTiming
parameter.