Parametric Curves is a collection of three Gimp plugins. The
plugins take as input a parametric curve and draw an approximate Bézier
Special curves is a collection of three plugins to draw
some specific curves.
The central aim of the plugins is to obtain a reasonably good
approximation using only a small number of control points. This is
contrary to the naive idea of just inserting control points more densely
on the curve in order to reach the desired accuracy.
Below you see two download buttons, one for each of the two
collections. By choosing either one you get a .zip file. Unzip it.
Inside you find, depending on which download button you took:
Parametric curves: Two files,
Special curves: One file
Those .py files you should insert in your Gimp's user's plug-ins
folder. When you restart Gimp, that file parametric_curves.py generates
in your Gimp three plugins:
Parametric curve (cartesian)
Parametric curve (polar)
Parametric curve (read function from file)
These are general-purpose plugins to draw parametric
curves. That doc.pdf file is documentation to their usage.
The first and second plugin you can certainly start experimenting with
even without reading the documentation. To try the the third plugin,
however, reading the documentation is necessary. That plugin expects part
of its inputs from a user-provided file, and to make that file you
need to read the instructions.
The file special_curves.py generates in your
Gimp six plugins:
Fourier3 with control of symmetry
They are plugins to draw some special curves. Each has
parameters that enable you to produce infinitely many different curves.
The plugins will be in Gimp's menu at Filters
> Render > Parametric curves > ....