These actors use the Java Advanced Imaging (JAI) package, from

You need not install JAI if you are not planning on using the JAI Actors.

For details about the JAI actors and Ptolemy, see:
James Yeh, " Image and Video Processing Libraries in Ptolemy II," Master's Report, Technical Memorandum No. UCB/ERL M03/52, University of California, Berkeley, CA, 94720, USA, December 16, 2003.

Ptolemy II 3.0