I have tried every combination of Luigis solution and get
"Black text do not overprint" (german: schwarzer Text wird
nicht überdruckt) for every page of the example for the
following code in the Preflight of Acrobat:
Here is an online version of the Preflight:
http://www.gronenberg.de/werkzeuge/pdf-online-check/upload.html
Here my code:
%%% overprint.tex
\nopdfcompression
\setupcolors[state=start,rgb=no,cmyk=yes,overprint=yes]
%% to be sure
\definecolor[CYAN][c=1.0,m=0,y=0,k=0]
\definecolor[MAGENTA][c=0,m=1,y=0,k=0]
\definecolor[YELLOW][c=0,m=0,y=1,k=0]
\starttext
\framed[background=color,backgroundcolor=CYAN,
frame=off,offset=.25cm,strut=no]{%BEGIN
\startcolorintent[overprint]
\framed[background=color,backgroundcolor=MAGENTA,
foregroundcolor=YELLOW,
align={lohi,middle},
frame=off,width=2.5cm,height=2cm]
{overprint \\
\startcolorintent[knockout]{knockout}\stopcolorintent}%
\stopcolorintent
\framed[background=color,backgroundcolor=MAGENTA,
foregroundcolor=YELLOW,align={lohi,middle},
frame=off,width=2.5cm,height=2cm]{knockout\\
\startcolorintent[overprint]{overprint}\stopcolorintent}%
}%END
\page
\framed[background=color,backgroundcolor=MAGENTA,
foregroundcolor=YELLOW,
align={lohi,middle},
frame=off,width=2.5cm,height=2cm]
{overprint \\
\startcolorintent[knockout]{knockout}\stopcolorintent}%
\page
\framed[background=color,backgroundcolor=MAGENTA,
foregroundcolor=YELLOW,
align={lohi,middle},
frame=off,width=2.5cm,height=2cm]
{overprint}%
\page
\framed[background=color,backgroundcolor=MAGENTA,
foregroundcolor=YELLOW,
align={lohi,middle},
frame=off,width=2.5cm,height=2cm]
{\startcolorintent[knockout]{knockout}\stopcolorintent}%
\page
\framed[background=color,backgroundcolor=MAGENTA,
foregroundcolor=YELLOW,align={lohi,middle},
frame=off,width=2.5cm,height=2cm]{knockout\\
\startcolorintent[overprint]{overprint}\stopcolorintent}%
\page
\framed[background=color,backgroundcolor=MAGENTA,
foregroundcolor=YELLOW,align={lohi,middle},
frame=off,width=2.5cm,height=2cm]{knockout}%
\page
\framed[background=color,backgroundcolor=MAGENTA,
foregroundcolor=YELLOW,align={lohi,middle},
frame=off,width=2.5cm,height=2cm]{\startcolorintent[overprint]{overprint}\stopcolorintent}%
\page
\framed[background=color,backgroundcolor=CYAN,
frame=off,offset=.25cm,strut=no]{%BEGIN
\startcolorintent[overprint]
\framed[background=color,backgroundcolor=MAGENTA,
foregroundcolor=YELLOW,
align={lohi,middle},
frame=off,width=2.5cm,height=2cm]
{overprint \\
\startcolorintent[knockout]{knockout}\stopcolorintent}%
\stopcolorintent
}
\page
\framed[background=color,backgroundcolor=CYAN,
frame=off,offset=.25cm,strut=no]{%BEGIN
\startcolorintent[overprint]
\framed[background=color,backgroundcolor=MAGENTA,
foregroundcolor=YELLOW,
align={lohi,middle},
frame=off,width=2.5cm,height=2cm]
{overprint}%
\stopcolorintent
}
\framed[background=color,backgroundcolor=CYAN,
frame=off,offset=.25cm,strut=no]{%BEGIN
\startcolorintent[overprint]
\framed[background=color,backgroundcolor=MAGENTA,
foregroundcolor=YELLOW,
align={lohi,middle},
frame=off,width=2.5cm,height=2cm]
{\startcolorintent[knockout]{knockout}\stopcolorintent}%
\stopcolorintent
}
\stoptext
Regards
Jannis
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