dear R experts---I am struggling with the requirements to prepare my files
for my printers.  I am printing in 2/2 format, which means cyan and black
for me, which they take from my color-separated pdf files.  R comes into
play, because it produces all the figures that are embedded in my book
(pdflatex).

now, TeX has no problems producing CMYK files.  However, R produces RGB
files (for Cairo-device pdf files).  The problem is that cyan in R's RGB  is
(0,255,255), and unfortunately when this is converted into CMYK, and from
then into color-separated plates (using adobe acrobat), it maps not into
100% cyan, but into much [but not full] CMYK cyan and a little bit of
yellow.

there was a discussion of this about 10 years ago on r-help, when it was
still not possible.  are there any hacks that get R to output CMYK pdf
files?  I don't need it to be general.  I just need the cyan color to map
perfectly.

I wonder whether I should switch to the tikzDevice.  (I know it exists, but
I have not used it yet.  is it reliable and is it reasonably well comparable
to pdf device capabilities)

advice appreciated.

sincerely,

/ivo welch

----
Ivo Welch (ivo.welch@gmail.com)
http://www.ivo-welch.info/

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