[scribus] Import CMYK colours correcting from SVG/EPS

[Teodor-Toma Silvestru Muntean]

Hi, I do an experiment, incredients Scribus 1.3.5, Ubuntu 8.10, color spaces RGB -Adobe 1998; CMYK -Fogra27L cmyk coated press. A Illustrator 10, color space CMYK -US webcoated (SWOP) v2 Photoshop cs2, color space RGB Adobe 1998, CMYK -US webcoated (SWOP) v2 so1) I draw one shape with this colors C:20% M:40% Y:60% K:0% in Adobe Illustrator, save it in this formats, ai (version 7, an eps based);  ai (version 10, pdf compatible);  eps;  pdf2) In Scribus 'import/get vector' the eps, and the 2 ai, the pdf can't import like this, so I make a image frame and import the pdf like image; and make an other one and import the eps again, but an image format this time ( this 2 image I expect to loose the color value because Scribus give a "colorspace: unknow" message), On page this 2 image-frame have closely but not same hue.3) export the document as pdfX-34) open the pdfX-3 in photoshop in cmyk color space and verify the color value'sResultAll  imported
 vector in scribus, then exported as pdf have a corect C:20% M:40% Y:60% K:0% color valueThe 2 image - frame have closely (how closely, I think, is a subjective appreciation) hue on screen but diff color value ( c:12%  m:44%  y:67%  k:0%) So, my apreciation is I can use Scribus for print without to much carrie about color alteration. Inkscape isn't have the goal to make 'for print targeted' documents, have goal to make 'for web' (sorry if I'm wrong). The Sk1 project (www.sk1project.org) will be expected to be a 'print targeted', but isn't in stable/usable stage yet.(again sorry if I make mistake) Forgive me for my english, please.
--- On Tue, 2/23/10, Julian Robbins <julian.robbins at q-par.com> wrote:

From: Julian Robbins <julian.robbins at q-par.com>
Subject: [scribus] Import CMYK colours correcting from SVG/EPS
To: scribus at lists.scribus.net
Date: Tuesday, February 23, 2010, 3:19 PM

Hi

We've had some fund and games !!

Not directly related to Scribus, but something I only found out about
recently is that SVG files only support RGB colourspace not CMYK.
Because of this, if using Inkscape, and saving in normal SVG format any
CMYK colours are saved into RGB equivalent. If I have a CMYK colour I
export as EPS from Inkscape, it too oddly won't save as CMYK, as
Inkscape still doesn't support this
https://bugs.launchpad.net/inkscape/+bug/171214

Now what's all this got to do with Scribus ?

Well although the colours themselves when you import these various files
ie SVG, and EPS are ok, the CMYK colour values aren't correct as you expect.

But after creating same files in Illustrator, and saving .ai, .svg and
.eps files, I would expect the .eps at least to show the correct CMYK
values on import into Scribus (using 1.3.6SVN), but it doesn't either.
The colour is more or less the same, but the CMYK values vary wildly.

Loading up the .ai file into Inkscape also doesn't show the right CMYK
values, similar colour match but wrong values.

Am I looking at this the wrong way, but how do people using a complete
FOSS system actually get a a fully correct workflow with CMYK using
Scribus, etc ?

Also, can you get the same actual CMYK colour using a different
combination of values of Cyan, Magenta, Yellow and Black ? If so,
perhaps this is what's happening - same colour, but different
(incorrect) make up to achieve it ?

-- 
Kind regards

Julian Robbins

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