Bézier Curves
Starting with version 3.0, both filter authors and end-users can take advantage of fully editable Bézier curves. The curve editor supports any number of anchor points, four point types (corner, cusp, smooth and symmetrical) and six curve continuation methods for defining curve behavior in the areas beyond the endpoints.
When you select a point or a handle you can adjust its coordinates via numeric entry fields, which allows for precise positioning. The curve editing area is zoomable and pannable, which solves the problem of unreachable points or handles beyond the editing area.
Here's an example of a filter that uses the curve shown above:
Bézier curves are implemented in the Filter Editor as a curve component:
Additionally, filter authors can make the editable Bézier curves available to filter end-users via the new control component, Curve Control:
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