How to Limit the color channels in a PDF file

Question

I have created a WPF system, it uses CMYK colors and works only with two channels: black and magenta. The problem I have is when I print the output to Adobe Acrobat Printer, the resulting PDF file has outputs in all four channels, For example:

When I have a shade of gray, the resulting output uses a mixture of all four channels to reproduce to gray, and this is not what I want: My output will go to a press system with only magenta and black channels.

It seems that the pdf printer does not respect CMYK values in the printed document and uses their RGB values to guess a good CMYK equivalent.

How can I force PDF to respect my color values?

Answer 1

I use websupergoos ABCpdf when it comes to CMYK-pdf-creation. Costs a few bucks thou...

Answer 2

My guess the problem is with the Windows printing subsystem that performs some CMYK->RGB->CMYK conversion along the way. The PDF printers are not really designed to create such specialized PDF files.
My recommendation is to use a 3rd party PDF library that can generate PDF files and gives you full control over the colors in the PDF file.