Here the results of my question: I asked my print-service, if the pdf I generated with the code (look at the end of this email), is ok. The text in the second frame should be overprinted. The answer of the printer: in the preflight he can see the overprinting, in the print-preview he can't. He was astonished - because he never had the difference between print-preview and preflight before. He is using Adobe Acrobat 10. Hope this information helps others to be cautious - an maybe someone can tell what's to do. Regards Jannis

\setupcolors[state=start,rgb=no,cmyk=yes] \definecolor[myc] [c=.40, m=.10, y=.50, k=0] \starttext \framed[% width=80mm,height=50mm, background=color, backgroundcolor=myc, ] {1 Overprinted or not?}

\blank[big]

\framed[% width=80mm,height=50mm, background=color, backgroundcolor=myc, ] {\startcolorintent[overprint]2 Overprinted or not?\stopcolorintent}

\blank[big]

\framed[% width=80mm,height=50mm, background=color, backgroundcolor=myc, ] {\startcolorintent[knockout]3 Overprinted or not?\stopcolorintent}

\stoptext

Regards Jannis