• it permits the user to specify an arbitrary number of colours, along with the points at which they are to be reached;
• it converts between RGB and HSV behind the scenes;
• it provides concentric and radial gradients;
• it provides a command \psBall that generates bullets with a three-dimensional appearance; and
• uses the xkeyval package for the extended key handling.

The authors are Martin Giese and Herbert Voß. The package is Copyright © 1998-2008 Martin Giese, Herbert Voß.