You can use Separate+ for GIMP to convert RGB to CMYK.

On Sun, Feb 14, 2016 at 7:29 PM, Rick Strong <rnstr...@magma.ca> wrote:

> Scribus and Inkscape are both good programs, which I have recently
> discovered from Simon Budig on this list.
>
> Do the vector stuff in Inkscape and the pixel stuff in Gimp, then do your
> layouts in Scribus.
>
> Don't forget to convert the RGB image/photo file to CMYK (4 colour) colour
> space for print.
> You might try www.rgb2cmyk.org to make that conversion before you place
> it in the Scribus layout.
> I haven't tried the service, but it's worth a shot.
>
> Output the photo to CMYK Tiff.
>
> Rick
>
> -----Original Message----- From: Steve Kinney
> Sent: Sunday, February 14, 2016 4:07 PM
> To: gimp-user-list@gnome.org
> Subject: Re: [Gimp-user] How to shrink photo, retain quality?? Business
> card design
>
> On 02/13/2016 11:04 AM, Rick Strong wrote:
>
>> I checked the Gotprint site. PDF is an acceptable format to send to
>> them. When I design magazines I send out PDFs to the printers.
>>
>> Photos should be 300 dpi, CMYK tiffs if you can, not jpegs. "RGB
>> must be converted to CMYK for print." Artwork CMYK, 600 dpi or
>> better.  Output all to PDF if you can. No compression, i.e. highest
>> resolution.
>>
>
> My installation of GIMP 2.8.10 throws an error message and writes an
> empty file when I try to export to PDF.  I don't normally do that,
> so I never noticed until just now.
>
> Scribus is really the "right tool" for a PDFing job.  You can tweak
> everything about the PDF file - size of print area, DPI, how
> embedded images are saved, vectorization of fonts, etc., via the
> document and export settings.  I use PNG files for image content
> when assembling layouts in Scribus.
>
> http://www.scribus.net/
>
> Inkscape completes a "trinity" of Free graphics power tools:  It's a
> vector editor, for tasks like making logos that will be re-used at
> many sizes in many formats, labels for offset printing, silk screen
> designs, etc.  Inkscape can export its native vector files, with or
> without embedded bitmaps, to PDF.
>
> https://inkscape.org/en/
>
> :o)
>
>
>
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