title: convert a pdf for print
body: <p>I have some pdf documents and I need to find a way to automate convert all the images included in the pdfs from RGB to CMYK.</p>
  
  <p>I prefer to use c# as programing language. I worked in the past with iTextSharp but it doesn't allow me to do this (it doesn't or I don't know). </p>
  
  <p>The question is: what should I use to extract all the images from a pdf, convert from RGB to CMYK and put all the converted images back (no other changes).</p>
  
  <p>Thanks.</p>