So how do you use PDF to output duotones to high end device? Use the PPD
for the output device when you create the PDF?

>If it does, you'll need to move the prolouge.ps and epilouge.ps files
>from the Xtras high_end folder to the same folder level as Distiller.
>You should also be aware that some application techinques involving
>color, such as tagging a TIFF with color in a page layout aplication,
>won't hold up in the PDF file. These kinds of techiques are called a
>"pre-separated" workflow. Other examples of pre-sep workflows include
>duotone, tritone and quadtone files from Photoshop, and DCS color
>separation.

>Another tbing to pay attention to is that the Distiller PPD defaults to
>an RGB color space. This means that items colored black, like text,
>often convert to RGB and then a rich cmyk black in printing. Fine for a
>composite device, but trouble for high end printing.