[pdftex] Two-color printing with pdftex

[Reinhard Kotucha]

On 21 November 2010 Siep Kroonenberg wrote:

 > On Sun, Nov 21, 2010 at 09:54:09AM +0000, Robin Fairbairns wrote:
 > > Taco Hoekwater <taco at elvenkind.com> wrote:
 > > 
 > > > On 11/21/2010 10:13 AM, Christopher Adams wrote:
 > > > > Any working code samples for this kind of thing? Very alluring concept.
 > > > 
 > > > In ConTeXt;
 > > > 
 > > > \setupcolors[state=start,rgb=no,cmyk=yes]
 > > > \definecolor[spotcolor][cyan]
 > > > 
 > > > No idea how to do that in latex, sorry.
 > > 
 > > there's a package spotcolor (yes: american spelling)
 > > (mirror.ctan.org/macros/latex/contrib/spotcolor)
 > > 
 > > which claims to do the job for latex: i've never got to the bottom of
 > > what's actually required (i've never printed "proper-like") but this
 > > might offer a start.
 > > 
 > > robin
 > 
 > Isn't it just a matter of using the cmyk color model with the LaTeX
 > color package? E.g.
 > 
 > \definecolor{colorname}{cmyk}{0.6,0,0,0.1}

Sure, this is more or less Taco's approach.  Taco is using a primary
color (cmyk 1 0 0 0) and tells the printer "replace Cyan by PANTONE384PC".

The spotcolor package does a bit more.  It uses PDF features in order
to define spot colors.  In this case a spot color can be separated by
name (PANTONE384PC) instead of by value (0.18 0 1 0.31).

Regards,
  Reinhard

-- 
----------------------------------------------------------------------------
Reinhard Kotucha			              Phone: +49-511-3373112
Marschnerstr. 25
D-30167 Hannover	                      mailto:reinhard.kotucha at web.de
----------------------------------------------------------------------------
Microsoft isn't the answer. Microsoft is the question, and the answer is NO.
----------------------------------------------------------------------------