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Thread: Pdf converting from RGB to CMYK

  1. #1
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    Default Pdf converting from RGB to CMYK

    Hi there,
    can anyone help me with converting pdf (or ps) files from RGB colorspace to CMYK colorspace, so I can have file needed in industrial printing companies?
    I've looked into covert - it seems to be only for pictures
    and ImageMagick - I can't figure it out

  2. #2
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    Default Re: Pdf converting from RGB to CMYK

    Quote Originally Posted by GazetaCypr View Post
    Hi there,
    can anyone help me with converting pdf (or ps) files from RGB colorspace to CMYK colorspace, so I can have file needed in industrial printing companies?
    I've looked into covert - it seems to be only for pictures
    and ImageMagick - I can't figure it out
    I've never tried this. Surfing suggested ImageMagick should do it. By chance did you look at PStill ? PStill PS/EPS to PDF converter

  3. #3
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    Default Re: Pdf converting from RGB to CMYK

    Inkscape can certainly open a PDF and it handles both RGB and CMYK but you might have to do the conversion colour by colour. However, there is quite an ecosystem of support for Inkscape; so it might be worth checking Inkscape. Draw Freely.

  4. #4
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    Default Re: Pdf converting from RGB to CMYK

    Thanks for the PStill link. I will certainly look into it. They say that if someone is doing a job commercially they would require to buy a license. So let's say I'm doing business cards for myself, does it apply to get license?

    Inkscape can it - of course, but only one page at a time. What if one have 100 pages? I know about Scribus, but it's more complicated to do text, few graphics and footnotes.

    What I'd like to do is: make a book in OpenOffice (Writer), export it to pdf, then convert RGB in pdf file into CMYK colorspace, and send file to publishing shop.

    When I try this: convert file.pdf -colorspace CMYK file-cmyk.pdf
    it does the job, but I loose much quality in that process.

  5. #5
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    Default Re: Pdf converting from RGB to CMYK

    On 2010-12-02 13:36, GazetaCypr wrote:

    > Inkscape can it - of course, but only one page at a time. What if one
    > have 100 pages?


    It has a man page with many command line options. Perhaps there is a
    combination fro doing it from the CLI, and thus, you can script the job.


    > When I try this: convert file.pdf -colorspace CMYK file-cmyk.pdf
    > it does the job, but I loose much quality in that process.


    Try ps conversion instead :-?

    Perhaps it is doing a bitmap conversion at low resolution. If that is so,
    you could perhaps specify a resolution.

    --
    Cheers / Saludos,

    Carlos E. R.
    (from 11.2 x86_64 "Emerald" at Telcontar)

  6. #6
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    Default Re: Pdf converting from RGB to CMYK

    Rather than using OpenOffice, you may be better using LaTeX, perhaps with the LyX frontend if you are unfamiliar with LaTeX, because this allows you to select the CMYK color model directly. The LyX Embedded Objects help file tells you how whether you are using LaTeX directly or LyX.

    Certainly for a 100 page book, LaTeX will be a better choice - use the KOMA Script book class which gives you many additional features over the standard book class. There is good documentation for this class in German and in English.

    You can send the PDF directly to a printer.

  7. #7
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    Default Re: Pdf converting from RGB to CMYK

    Thanks for suggestions.
    I just downloaded LyX - will look into it.

    PStill does not work on my OpenSuse 11.2 (64-bit).

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