|
Rotation moves the filtered image clockwise around the center.
The maximum amount of rotation (100%) is the arc size of one
slice. Since all slices are identical, rotating by more than
one slice has no benefit. All that it would do is to periodically
repeat exactly the same pattern every time that the rotation
crossed a multiple of the slice size. So by limiting the
rotation to just the size of one slice you get much finer
control over the image movement, with 100 steps over one
slice instead of 100 steps over a full circle.
For example, if Split is set to 4,
then the image is split into 4 slices and each slice covers
a 90 degree arc of the image (one fourth of a full circle of
360 degrees = 90 degrees). Rotation then moves the image
clockwise from 0 to 90 degress.
The following diagrams illustrate what happens with Split
set to 4 and Rotation at 0 compared to 50 (50% x 90 degrees = 45
degress).
Rotation = 0
|
|
Rotation = 50
|
|
