[XeTeX] Color management

[Bruno Voisin]

Le 11 janv. 05, à 19:54, Christophe DAMAS a écrit :

> Perhaps there is a way to use CMYK model in XeTeX ? But it's important 
> that colors in the PDF file be described using CMYK model.

There was a thread touching partly this topic on 27 December. I'm 
reproducing below one message, by Jonathan. Hope this helps,

Bruno Voisin (back to studying the specifs of iWork, waiting for the 
webcast)

> De: Jonathan Kew
> Date: 27 décembre 2004 23:28:02 GMT+01:00
> À: Unicode-based TeX for Mac OS X
> Objet: Rép : [XeTeX] Color names in XeTeX
>
> On 27 Dec 2004, at 10:01 pm, Bruno Voisin wrote:
>
>> 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}
>
> The "original" XeTeX \specials all use an "x:" prefix, and yes, the 
> x:textcolor \special expects 6-digit hex RGB values. (Or 8-digit hex 
> RGBA values, if you want transparency.)
>
> However, XeTeX now also supports dvipdfm-style "color" \specials as 
> well, or at least some forms of them; you can use, I think:
> 	color push
> 	color pop
> 	color <colorspace> <values>
> where
> 	<colorspace> is one of gray/rgb/hsb/hsv/hls/cmyk
> and
> 	<values> is a space-separated series (one, three, or four, depending 
> on <colorspace>) of decimal values in the 0.0 .. 1.0 range.
>
> This was added at the same time as the (limited) hyperref support, 
> being also based on the \special support in dvipdfm. (From your 
> example, it looks like dvips may use the same \special syntax for 
> colors, too.) There's a one-line mention of the feature in the notes 
> from release 0.87, for those who were paying close attention at that 
> particular moment!
>
> HTH. Don't you wish XeTeX had some real documentation? ;-)
>
> JK