I need to provide a duotone pdf (say black and cyan). My figures are made with tikz, pgfplots and asymptote (3D but no prc), some with opacity effects. I compile with pdftex and luatex.
What do I have to do so that it works smoothly? I can think of defining new cycle list for pgfplots and, of course, not using blue or red in tikz or in asymptote. Is there something else? Will opacity work?
What kind of colors can I use? How can I define them with xcolors? What rationale do one use to name those colors?
Regarding color pictures. Do I need to convert them outside of TeX or is there a way to do it from TeX?