2011

To:Use:
Select either lens correction or distortion. This affects all other
parameters. The other parameters will be considered either in a
Mode
distortion or in a correction work flow. The distortion transforma-
tion is exactly the inverse of the correction, so keeping the same
parameters and putting back to back distortion plus rectification
will give back the original result, but filtered twice at each trans-
formation resulting in possible degradation in image quality.
Set the first parameter (k1) of the lens distortion equation: rd = r
+ k1 * r^3 + k2 * r^5.
Magnitude
Set the second parameter (k2) of the lens distortion equation: rd
= r + k1 * r^3 + k2 * r^5.
Adjustment
Characterize anamorphic asymmetry. Note that this has nothing
to do with the pixel aspect ratio of the captured image.
Anamorphism
Set the X and Y coordinates of the center of the distortion. Those
parameters are expressed in pixels. The lens center can also be
Center
changed by clicking directly in the player. The center manipulator
is always active in the player. The look of the manipulator is a
cross. The cross can be manipulated by selecting it and moving
it.
To determine the region where the lens distortion or correction
is applied. This parameter is initialized to the composition height.
Height
To set the height input to the input height.This parameter is
needed to be able to perfectly inverse a lens correction.
Fit Source
Expected Workflows
The following are common use cases for lens distortion or correction:
■ Footage to be used as a background layer has noticeable lens distortion
and footage to be composited over the background does not. The Lens
488 | Chapter 19 Warping