[XeTeX] Outputing PDFs in CMYK ColorSpace

[Wilfred van Rooijen]

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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