How I can write colored text which contain a certain level of transparency. I saw in other pdf lib it was possible. How it works with this lib.
I already discovered the solution:
PDExtGState extGState = (PDExtGState) PDExtGState.META.createNew();
// open a device to the page content stream
CSCreator creator = CSCreator.createNew(page);
… back from holidays - thank you for sharing your solution.