[XeTeX] cmyk encoded files

[Daniel Greenhoe]

2011/11/20 Zdenek Wagner <zdenek.wagner at gmail.com>:
> Printed colour samples are commercially available.
> They are printed on different types of papers and CMYK values are given.

Is there any such thing available in book form? That is, could you
make a recommendation? Here in Taiwan, there is something commonly
sold called Pantone彩色聖經 (Pantone Cai3Se4 Sheng4Jing1 = Pantone Color
Bible). I did finally locate one in a bookstore yesterday, but it was
sealed up and I wasn't allowed to open it without buying it.

Dan



2011/11/20 Zdenek Wagner <zdenek.wagner at gmail.com>:
> 2011/11/20 Daniel Greenhoe <dgreenhoe at gmail.com>:
>> 2011/11/20 Zdenek Wagner <zdenek.wagner at gmail.com>:
>>> No.
>>
>>> LCMS is a good choice.
>> LCMS is "Little Color Management System"?
>> (http://www.color.org/opensource.xalter)?
>>
> Yes.
>
>>> 1. It ensures that the colours you specify in the document will be converted to cmyk.
>>> However, the corrections are wrong.
>>> 2. xcolor does not look into inserted graphics,...
>>
>> But what if I hand define all my colors using cmyk syntax like this for example
>>     \definecolor{magenta}{cmyk}{0,1,0,0}
>> and create all my graphics using pstricks and related packages (with
>> no inserted graphics)?
>> Then won't the resulting pdf be cmyk compliant and contain exactly the
>> colors I defined?
>>
> That's what I do. Printed colour samples are commercially available.
> They are printed on different types of papers and CMYK values are
> given. Thus you select the required colour on a proper paper and use
> it. Sometimes I select the colour in gimp and then using LCMS convert
> the values from RGB to CMYK. Scanned images are also easy. I keep them
> as TIF, using LCMS convert them to CMYK and then by tiff2pdf to PDF
> that can be included by \includegraphics.
>
>> Dan
>>
>>
>>
>>
>> 2011/11/20 Zdenek Wagner <zdenek.wagner at gmail.com>:
>>> 2011/11/19 Daniel Greenhoe <dgreenhoe at gmail.com>:
>>>> Print shops often require pdf files containing color to be encoded
>>>> using CMYK colorspace values.
>>>>
>>>> Version 2.11 of the xcolor package says that cmyk is "supported by
>>>> Postscripts directly" (page 8). So if I simply specify
>>>>  \usepackage[cmyk]{xcolor}
>>>> in the preamble and compile with XeTeX/XeLaTeX, is that sufficient to
>>>> ensure the resulting pdf is cmyk encoded?
>>>>
>>> No.
>>>
>>> 1. It ensures that the colours you specify in the document will be
>>> converted to cmyk. However, the corrections are wrong. If you wish to
>>> convert the colours properly, you have to use colour profiles. LCMS is
>>> a good choice. Useful ICC profiles come with different products as
>>> Adobe Reader, colour printers, scanners etc. They can also be
>>> downloaded from the web. Calculations in the xcolor package can only
>>> be used if you are satisfied with approximate colours. It is written
>>> in the documentation that conversions are device dependent.
>>>
>>> 2. xcolor does not look into inserted graphics, you have to convert
>>> your images to cmyk separately. Again LCMS is a good tool for this
>>> purpose.
>>>
>>>> Secondly, is there any free utility available for checking the
>>>> colorspace encoding of pdf files (maybe similar to foolab's pdffonts
>>>> for checking embedded fonts).
>>>>
>>> I have not found any. Since I produce PDF files for printing very
>>> often, I calculated that commercial Adobe Acrobat is cheaper than the
>>> risk of paying unusable books, thus I have bought it.
>>>
>>>> Many thanks in advance,
>>>> Dan
>>>>
>>>>
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>>>
>>>
>>>
>>> --
>>> Zdeněk Wagner
>>> http://hroch486.icpf.cas.cz/wagner/
>>> http://icebearsoft.euweb.cz
>>>
>>>
>>>
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>>
>>
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>
>
>
> --
> Zdeněk Wagner
> http://hroch486.icpf.cas.cz/wagner/
> http://icebearsoft.euweb.cz
>
>
>
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