Hi, esp. Hans,
while finalizing the PDF for our latest book, I recognized a color problem:
The general black color is rendered not 100% black in CMYK mode, but in
all channels (converted RGB, I guess).
With
\definecolor[cmykblack][k=1]
\setupcolors[textcolor=cmykblack]
this is ok, but the color mode is knockout instead of overprint (as it
would be usual for CMYK black). That means, black text on a photo is
white in the other plates.
If I define
\definecolor[cmykblack][k=1,a=multiply,t=1]
\setupcolors[textcolor=cmykblack]
it’s ok in some places, but it messes up many unrelated places, e.g.
most images then also use this transparency mode.
\setupcolors[intent=overprint]
has no effect, as far as could find (while we have a warning in the
wiki, that you should use this only for grayscale works).
What can I do?
Hraban
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