> El dom, 01-06-2014 a las 13:53 +0000,
> inkscape-user-request@...125... escribió:
> > Gez, I know inkscape doesnt really work well for a purely CMYK
> > workflow,
> > I knew that from the start. I must say that your statement about CMYK
> > values tied to press settings are not what I, nor anyone I know in
> > print and design have been doing, maybe your statement would make more
> > sense(for me anyway) if you mentioned that printer ICC profiles are
> > tied
> > to specific press settings.
>
> Man, saying that a printer ICC profile is tied to specific press
> settings and saying that a specific set of CMYK values is tied to
> specific press settings is the same.
> Are you saying that they are different things and a specific set of CMYK
> values will print the same in any press?
> If that's what you're saying you and "anyone you know in print" are
> wrong. :-p
>
It's supposed to but it isn't. My point was that a CMYK colour is
determined by the values you in put, of course there are tons of
variables that determine if we actually get this colour but a CMYK break
down is just that, a breakdown of how the inks will mix. 10%=Cyan, 15%
=Magenta, 30%=Yellow 40%=Black, you are asking the printer to mix his
inks with these values.
> But don't take my word, just grab two Pantone Bridge books, one for the
> US market and the other for the Euro market and explain why the same
> Pantone colors have different values when "converted" to CMYK.
>
No dispute on this at all, I agree.
> Also check the press settings stated in those books, and you'll see that
> the print setup varies.
> Why do you think they do that?
You cant give a printer a RGB image and say just print this to this
profile it should be fine. Your image should be teh correct
colourspace.
>
> Your CMYK values are meaningless if you don't know the colorspace
> they're tied to.
The colourspace is CMYK, the profile will depend on the output.
> Your CMYK values won't print the exact color you want
> if you take them to two different presses with different setups and
> paper stocks.
CMYK values specify a colour, I agree that I wont get the same colour
from any printer, their setups vary. Colours will appear differntly on
different stock, but it is the the profiles that change the CMYK values
to be better suited for coated/uncoated stock and print processes. Don't
believe me Link two different profiles and see if the colour remains the
same even with 100K. The profiles change the values. The values
determine the colour.
>
> Of course they are tied to the press settings, and ICC profiles are how
> you communicate it to the color management engine.
I am saying that CMYK values determine a specific colour not ICC
profiles. ICC profiles will change the CMYK values so that you have the
colour you want based on your output.
>
> Anyway, maybe you missed the point of what I tried to say (or I did a
> lousy job explaining it, it's possible too :-)
Well I'm sure we can hash this out forever, we both have workflows that
have been working for us in a practical sense. Oneday when I visit your
country I will be sure to look you up and we can do it over a beer or
six.
> The point is that you can get good results with a intermediate binding
> workflow. I'm not saying that you should send RGB.
Yeah for graphics, but what happens when you have an image. I wanted to
know if we can save a purely CMYK file WITHOUT the extra step in
scribus. We can't because cairo doesnt fully support CMYK.
Ghostscript does, this was my question, it there a way to use
ghostscript in the output PDF from Inkscape.
> If you do everything in RGB in Inkscape and let Scribus to convert the
> RGB values to the desired CMYK profile, you'll get good results.
> As Chris pointed out, there are some aspects that have to be considered,
> and black type is one of them.
> If your print provider doesn't have the specific preflight rules for it,
> black will be printed as composite black and you don't want that for
> your small type.
> In that case, you can replace the RGB black 100% K in Scribus (or in
> inkscape with the CMS tab before taking the SVG to Scribus).
I'm not disputing this, this is the only to do it. I was asking can we
make a fully CMYK colourspace pdf from inkscape using ghostscript,
seeing as how cairo doesnt fully allow for this.
>
> As I mentioned in the other mail, I do that all the time with excellent
> results, and some of the stuff I do that way goes to top print providers
> who print large runs for national distribution. Believe me I wouldn't
> use this software for that if I wasn't sure about it.
Same here, I would have left it ages ago, I find it works best for
logo's and web graphics and it does what I need except give me a CMYK
colourspace PDF without going into Scribus or Moonshiner.
I don't really want to continue with this thread, whatever you say next
I will agree to (depends on what you say, but I will) and we can
put it to rest.
Judah
