Triggered my memory - The Gimp (an image editing program) and Scribus (a desktop publishing program) both support CMYK colour spaces natively and will print in (or produce colour separations for) true process colour space.
Both are free (free of licensing restrictions and free as in no $ need exchange hands) and work very well.
Donald.
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----- Original Message -----
> From: "lists" <Stuartlists@...>
> To: "Homebrew PCBs" <Homebrew_PCBs@yahoogroups.com>
> Sent: Friday, October 7, 2011 5:21:59 PM
> Subject: Re: [Homebrew_PCBs] Forcing printing of Magenta or Cyan from RGB in Windows
> In article
> <CAFgkapC58p0cp9Sik=AXAUPJx8=omhKzvTbz6rzQ1JZZzHmjDA@...>,
> Andrew Thornber <andrew.thornber@...> wrote:
>
> > Personally if you need to print CMYK then have a look at photo
> > printers
> > as they print in the CMYK space. (It's oldish but to prove a point
> > have
> > a look at the Epson C82)
>
> I think you will find that all printers, including "home" printers use
> CMYK. Certainly all the ink-jets I have owned did. The difference with
> the
> "photo" printers was that they used two further inks, paler versions
> of
> cyan and magenta usually, in order to achieve the delicacy of colour.
>
> One rather old piece of DTP software I have could produce the required
> CMYK separations as separate files on a disc for submission to a
> commercial printer. I guess it would have been possible just to print
> locally from one of these separations.
>
> Although of necessity it uses RGB to display stuff, Photoshop can use
> a
> variety of "colour spaces" internally but I'm not enough of an expert
> to
> know whether it can print the separate colours to a printer.
>
> However, photoshop is just a teeny bit expensive!
>
> --
> Stuart Winsor
>
>
>
>
>
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