Apple Shake 4 - Manual (Page 813)

Chapter 27 Warping and Morphing Images 813
Parameters
This node displays the following controls in the Parameters tab:
analyze
After you’ve created one or more shapes to trace distorted features within the image in
the Viewer, clicking calibrate automatically sets the factor and Kappa parameters to the
values necessary to either correct or match the lens distortion.
analyze state
This parameter indicates whether or not the analysis has been made.
Off, Distort, Undistort
Use this control to toggle the LensWarp node between three modes:
• Off: Disables the effect of the LensWarp node. Make sure the LensWarp node is
turned off before you add calibration shapes.
• Distort: Warps the image to introduce lens curvature to the image. This mode is
useful for matching the lens curvature in another image.
• Undistort: Warps the image to remove lens curvature.
factor
A two-dimensional parameter that lets you adjust the amount of vertical and horizontal
curvature. Opening the subtree lets you edit the X and Y dimensions independently.
kappa
The amount of warping applied to the image. Typical adjustments fall between 0 and
1.5, but higher adjustments can be made if necessary.
Negative values produce opposite effects—if the LensWarp node is set to Distort,
negative kappa values undistort the image. If it is set to Undistort, negative values
distort the image. This enables you to animate changes from one state to another.
center
The center of the warp performed to the image. By default, xCenter is set to
width/2 ,
and yCenter is set to height/2 .
Delete Control
Point Select a point and click this button to remove it from the
shape.
Enable/Disable
Shape Transform
Control Lets you show or hide the transform control at the center of
each shape. Hiding these controls will prevent you from
accidentally transforming shapes while making adjustments
to control points.
Button Description