See docs directory for full introduction

compile with a simple javac or in an IDE:
javac -cp lib -d bin -sourcepath src src/com/jeremyparsons/imaging/*.java

See make_jar_command for how to make a binary release jar
See make_src_tar_command for how to make a source code release

Increase the heap size if you have many threads (to avoid memory starvation)
java -Xmx2500m -jar JPEGDirCopy.jar