Just to clarify, Hans: I thought \setupcolors[state=stop] was the
default, so I did not include it in the preamble, especially since I
have not had the problem previously with any MPgraphics I have used.
Perhaps I need to explicitly include the state=stop? I use no other
colour commands in the entire file.
It will be Monday before I can contact the printing house again. All I
know for now is that the prepress person insisted that 'it was the 10
chapter titles' that included 4 colours.
Of course, it is always possible that other graphics in the file have
caused the problem so I will indeed check them all, though I had already
done that, so I don't believe they are the problem.
It is just that I have done more than 100 books for this printing house,
all with ConTeXt, and have not run across this problem before, so I
assumed it might be the \startuseMPgraphic case that I mentioned. It is
not an example I created myself. I got it from one or other site, but
cannot remember which. It met the auithor's demands, but I am prepared
to admit it might not be the best use case.
Julian
On 12/9/25 18:00, Hans Hagen via ntg-context wrote:
On 9/12/2025 7:49 AM, jbf wrote:
This is very definitely an MPgraphic and colour issue. I have used
the MPgraphic script below to produce a particular Chapter title
(which the author wants). I resolved another issue I had with it, and
had raised earlier on this list, but the printshop has just contacted
me to say that all chapter titles (10 of them) have come out in 4
colours and they want them in grayscale.
Now, I can probably resolve the issue outside of ConTeXt by
converting the entire pdf to grayscale later in another program, but
I just thought that before I do that I would ask if there is someone
who can point to a way, within the MPgraphic script below, to ensure
that we do not get a colour, but a grayscale (B&W) product.
Julian
\startuseMPgraphic{MyChapterGraphic}
picture toc, num ;
toc :=
textext("\unframed[width=8cm,align=normal,offset=3mm,leftframe=on,rulethickness=1pt]
{%
{\switchtobodyfont[18pt]\labeltext{mychapter}}\blank[small]
{\switchtobodyfont[12pt] \MPtext{2}}\blank[big]
\placecombinedlist[MyContent]
}") ;
toc := toc shifted (-llcorner toc) ;
num := textext("\MPtext{1}") ;
num := num ysized 0.8(ypart ulcorner toc) ;
num := num shifted (-llcorner num) ;
num := num shifted (-0.65(xpart lrcorner num), 0.1(ypart ulcorner
toc) ) ;
clip num to ((-10cm,0) -- (0,0) -- ulcorner toc -- (-10cm, ypart
ulcorner toc) -- cycle) ;
draw toc ;
draw num ;
currentpicture := currentpicture xshifted 0.4(TextWidth - xpart
lrcorner toc - xpart llcorner num) ;
setbounds currentpicture to unitsquare xyscaled (TextWidth, ypart
urcorner toc) ;
\stopuseMPgraphic
This example doesn't show what you do with colors. But
\setupcolors[state=stop]
\starttext
\startMPpage
fill fullsquare scaled 10cm withcolor (.4,.5,.6,.7) ;
fill fullsquare scaled 5cm withcolor (.4,.5,.6) ;
fill fullsquare scaled 2cm withcolor (.4) ;
\stopMPpage
\stoptext
should produce gray scale output when you use the proper commands for
color. In doubt, make some minimal example and look in the pdf page
stream. I wouldn't rely on what a printer tells, definitely not when
the file went throgh some pdf application before printing. I remember
two cases:
- a printing house phoning about some bitmap in a file that only had
vector graphics (experienced printer who basically wanted our
confirmation that the tool they used was crap and then just printed)
- a printing house complaining about zero width lines that actually
resulted from their validation / cleanup toolchain (so they just
printed what we send them and all was fine)
So best look in the file and configure rendering right when there are
colors. Or maybe in your case the cmyk comes from some included image
which you then need to convert.
Hans
-----------------------------------------------------------------
Hans Hagen | PRAGMA ADE
Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
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