[XeTeX] Color names in XeTeX

[Bruno Voisin]

Le 27 déc. 04, à 19:08, Jonathan Kew a écrit :
>
> 	\def\myredcolor{rgb 0.8 0.0 0.0}
> 	\def\mydarkcyancolor{cmyk 1.0 0.0 0.0 0.5}
>
> 	Some text... \special{color \myredcolor} ...red text...
> 	\special{color \mydarkcyancolor} ...cyan text...

Is \special{color cmyk 1.0 0.0 0.0 0.5} an indication that:

- A simplified XeTeX color \special syntax is available?

- CMYK color specification work in XeTeX?

So far I thought, according to XeTeX-notes.tex, that only RGB 6-digit 
hex values were allowed, in the form:

	\special{x:textcolorpush}
	\special{x:textcolor=4444CC}
	Some text
	\special{x:textcolorpop}

I'm asking this because I've been thinking to update my departmental 
letterhead macro file, such that it can be used with XeTeX. There's a 
LaTeX version and a plain TeX version as well (which I'm probably the 
only person to use). In it I need to write some footer in the two 
shades of blue of my departmental logo, which are CMYK colors. So far 
here's what I've been doing

	\def\darkblue#1{\Color{1. .43 0. .18}{#1}}
	\def\lightblue#1{\Color{1. .09 0. 0.}{#1}}

	% For pdfTeX
      \ifpdf
	  \input pdfcolor
	  \def\Color##1##2{\pdfsetcolor{##1}##2\pdfsetcolor{\maincolor}}
	\else
	% For XeTeX
        \ifxetex
	    \def\Color##1##2{##2} % for lack of knowing better
	  \else
	% For Textures
	    \iftextures
	      \def\Color##1##2{\special{color push}\special{color cmyk ##1}##2%
	        \special{color pop}}
	    \else
	% For dvips
	      \def\Color##1##2{\special{color push cmyk ##1}##2\special{color 
pop}}
	    \fi
	  \fi
	 \fi

I was planning to look at some point at Ross' xetex.def, to see how 
color switches are defined, but had not found the time so far.

Bruno Voisin