This callback interface can be used to implement a method that
allows to initiate printing a sequence of slides described by
a "page range" string (page numbers seperated by semicolons and
low - high ranges like 1;2;8-10).
Copyright (C) 2000 Helge Hackbarth, All Rights Reserved
Interface for a Component like a Scrollbar that allows to
implement a class used by class SmartScrollPane which is
either based on java.awt.Scrollbar or javax.swing.JScrollBar.
The ImageProducer can deliver the pixels in any order, but
the ImageConsumer may be able to scale or convert the pixels
to the destination ColorModel more efficiently or with higher
quality if it knows some information about how the pixels will
be delivered up front.