Sun provides the JAI addon with support
for additional graphical formats including multi-page tiff for faxes and
ppm files used with xpdf for pdf support on unix systems. For Linux and
Windows go to http://java.sun.com/products/java-media/jai/ and download and install JAI for your platform. For the Mac go to http://www.apple.com/downloads/macosx/apple/java3dandjavaadvancedimagingupdate.html. Note:
there seem to be two JAI's to install - the connection between them is
not clear to me. Make sure to install the "JAI Image I/O API" along with
the JAI itself.