I need to export a drawing to PDF for print production.
I am only using black (YMCB=0,0,0,1) and pure cyan (YMCB=0,0,1,0).
However, the generated PDF always contains data in all four color planes.
I.e., the resulting PDF does contain yellow and magenta.
How can I tell Omni graffle to export the YMCB colors without conversion?