[XeTeX] Outputing PDFs in CMYK ColorSpace

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Clinton,

If you find a way to get only K channel from Inkscape, let me know.

GIMP: when I save Jpegs in Gimp, even if I change the mode to greyscale, the
image that is output still has CMY black, when included into a pdf by
Scribus.  How I dealt with this was using Scribus' built-in greyscale option
for each image.

Inkscape: I have not found a way to manage channels in Inkscape yet.  It
seems to default to CMYK, even for pure black documents.

ImageMagick, I have not yet tried.

I would really like a high-quality PDF processor for Linux.

Please do let us know your success!

Thanks, Love, Peace,
Link


On Tue, Jan 19, 2010 at 11:27 AM, Wilfred van Rooijen <wvanrooijen at yahoo.com
> wrote:

> Hi,
>
> For the conversion of figures you might look at ImageMagick or GIMP, both
> of which are available for linux. For PDF, maybe InkScape can help? I think
> you can run InkScape in batch mode.
>
> Regards,
> Wilfred van Rooijen
>
> --- On Tue, 19/1/10, Clinton Gormley <clint at traveljury.com> wrote:
>
> > From: Clinton Gormley <clint at traveljury.com>
> > Subject: Re: [XeTeX] Outputing PDFs in CMYK ColorSpace
> > To: "Unicode-based TeX for Mac OS X and other platforms" <xetex at tug.org>
> > Date: Tuesday, 19 January, 2010, 3:28 AM
> > Hi all
> >
> > > > I'm producing PDFs with xelatex destined to be
> > printed in a newspaper.
> > > > The printers require the PDFs to use a CMYK
> > colorspace, but I can't find
> > > > any option to set this..
> > >
> > > You need provide more information about the document:
> > do you have
> > > external figures/graphics?   What
> > colorspace do they use?  How is
> > > color used in the document -- just a few specific
> > colors or
> > > many colors?
> >
> > Typically, these adverts just use black on white, and
> > include an image
> > (uploaded by a customer), which could be pretty much
> > anything.
> >
> > > Is this a 1-shot project or something you will be
> > doing many times?
> >
> > Many times - it is an online ad booking service.
> >
> > > The CMYK conversion needs to be checked for your
> > documents.  The OP
> > > does mention
> > > some of the quick checks the printer made using Adobe
> > Acrobat that
> > > found problems
> > > with the color usage in the document.  Such
> > checking is standard
> > > practice, and you
> > > should try to find a way to perform the checks
> > yourself.
> >
> > Michiel Kamermans suggested "quite a box of tricks", but
> > our servers run
> > linux, and that app is windows/mac only.
> >
> >
> > > Post-processing using commercial tools may give better
> > CMYK results.
> > > If you use external figures you may get better results
> > converting them to CMYK
> > > before processing with xelatex as the conversion can
> > be tweaked for each image.
> >
> > Excuse my ignorance here, but is that a process that can be
> > automated?
> > I'm guessing that if an image doesn't include a profile,
> > then you're
> > stuck with checking it manually.
> >
> > >
> > > Many low-end tools do not convert RGB to CMYK
> > reliably.  You may end up with
> > > "black" that has CMYK with small CMY values or map a
> > range of colors to the
> > > same CMY values.  There are tools that help check
> > color usage in a document --
> > > many printers use them and will refuse to print a file
> > that has
> > > problems, but of
> > > course it is better if you can provide a high-quality
> > PDF from the start.
> >
> > Any of them that work on linux?
> >
> > thanks
> >
> > Clint
> >
> >
> >
> >
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