obviously not.  thank you, henrik.  going back to square 101.  (I just
googled, because I usually find stuff faster by googling.  cmyk and R
brought up nothing.)

apologies for the bandwidth, everyone.

----
Ivo Welch (ivo.welch@gmail.com)



On Tue, Sep 13, 2011 at 4:24 PM, Henrik Bengtsson <hb@biostat.ucsf.edu>wrote:

> Did you ask your question being aware of the following from
> help("pdf") in R v2.13.1:
>
> <quote>
> pdf(file = ifelse(onefile, "Rplots.pdf", "Rplot%03d.pdf"),
>    width, height, onefile, family, title, fonts, version,
>    paper, encoding, bg, fg, pointsize, pagecentre, colormodel,
>    useDingbats, useKerning, fillOddEven, maxRasters)
>
> Arguments:
> ...
> colormodel      :
> a character string describing the color model: currently allowed
> values are "rgb", "gray" and "cmyk". Defaults to "rgb".
>
> Color models:
> The default color model is sRGB, and model "gray" maps sRGB colors to
> greyscale using perceived luminosity (biased towards green). "cmyk"
> outputs in CMYK colorspace. The simplest possible conversion from sRGB
> to CMYK is used
> (http://en.wikipedia.org/wiki/CMYK_color_model#Mapping_RGB_to_CMYK).
>
> Raster images are output in RGB under the "gray" and "cmyk" models.
> </quote>
>
> My $.02
>
> /Henrik
>
> On Tue, Sep 13, 2011 at 3:28 PM, ivo welch <ivo.welch@gmail.com> wrote:
> > 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/
> >
> >        [[alternative HTML version deleted]]
> >
> > ______________________________________________
> > R-help@r-project.org mailing list
> > https://stat.ethz.ch/mailman/listinfo/r-help
> > PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> > and provide commented, minimal, self-contained, reproducible code.
> >
>

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