We just upgraded to a pdf workflow, and have have a few issues, one of which:
Sometimes, when we output a jdf from Preps using color mapping, and only want to output one out of several colors from the file, it will still print some (not all) of the colors.
Example: File has six colors. We print the jdf out of preps, only making sure that "Spot Color X" is checked. Then we drop the jdf into our Nexus workflow in order to output an HP of that imposition, and then release the 1-bit tiffs. In the workflow, the HP file will print two colors: Black, Spot Color X. It also writes the 1-bit tiff file for both colors. But because the HP shows both colors, we need this issue resolved.
One such file we tested over and over again, and it seemed like eliminating the gradient overprint from an Illustrator CS5 file made us able to process the file with only the single Spot Color. But is this an Illustrator CS5 issue, a Preps issue, or an Esko issue?
I'd love to say the Nexus support people have been helpful, but I'd be lying through my teeth.