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<div class="moz-cite-prefix">David Carlisle wrote:<br>
</div>
<blockquote
cite="mid:CAEW6iOiMc8D3ZhhVoJjqNJqoyxZ03o7hhPCpBZCT7fUK67VP3A@mail.gmail.com"
type="cite">
<pre wrap="">see the color package documentation
\color[cmyk]{0.1,0.2,0.3,0.4} hello
</pre>
</blockquote>
<br>
<div class="moz-cite-prefix">Zdenek Wagner wrote:<br>
</div>
<blockquote
cite="mid:CAC1phyZ=YiOjstyFA9xD--d4mvkOd2h+34-qzDUGQUqwXqUhqA@mail.gmail.com"
type="cite">
<pre wrap="">if you want to use the colour feature of the OpenType fonts, only RGB
is supported. The color package allows you to use both CMYK and
grayscale (both are allowed in the printing industry). You can, of
course, set the colour by promitives. You have to use both k and K for
CMYK and both g and G for grayscale (r and R are for RGB). We have a
nice article on simple graphics in CSTUG Bulletin, but only in Czech,
see <a moz-do-not-send="true" class="moz-txt-link-freetext" href="http://bulletin.cstug.cz/doi.php/10.5300/2013-1/13">http://bulletin.cstug.cz/doi.php/10.5300/2013-1/13</a>
Zdeněk Wagner
<a moz-do-not-send="true" class="moz-txt-link-freetext" href="http://ttsm.icpf.cas.cz/team/wagner.shtml">http://ttsm.icpf.cas.cz/team/wagner.shtml</a>
<a moz-do-not-send="true" class="moz-txt-link-freetext" href="http://icebearsoft.euweb.cz">http://icebearsoft.euweb.cz</a></pre>
</blockquote>
My thanks to you both. I am beginning to realise just how complex
the world of colour is when it comes to typesetting/printing (a fact
of which I have remained in blissful ignorance until now). I am
also starting to think that the pre-flight check for "List non B/W
objects" in Adobe Acrobat 7.1 are not as reliable as one might hope
-- the behaviour does not seem to be deterministic, nor does it
appear to tally with reality : all six pages of the PDF generated
by code below are reported as "Object uses black only is not true".
But I am even more confused to discover that in XeTeX, the first
four blocks all yield visibly black-on-white text, yet only two
instances yields true black while two of the others yield RGB black
and the fifth yields RGB white -- this must indicate that I do not
understand the function of the "transparency" byte in XeTeX's font
syntax. And the sixth and final block yields RGB black despite the
call to \color [cmyk] ...<br>
<br>
<tt>\nopagenumbers<br>
<br>
</tt><tt>
</tt>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
margin-right:0px; -qt-block-indent:0; text-indent:0px;"> </p>
<tt>
</tt>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
margin-right:0px; -qt-block-indent:0; text-indent:0px;"><tt>
\input eplain</tt></p>
<tt>
</tt>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
margin-right:0px; -qt-block-indent:0; text-indent:0px;"><tt>
\beginpackages</tt></p>
<tt>
</tt>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
margin-right:0px; -qt-block-indent:0; text-indent:0px;"><tt>
\usepackage {color}</tt></p>
<tt>
</tt>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
margin-right:0px; -qt-block-indent:0; text-indent:0px;"><tt>
\endpackages<br>
<br>
</tt></p>
<tt>
</tt>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
margin-right:0px; -qt-block-indent:0; text-indent:0px;"> </p>
<tt>
</tt>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
margin-right:0px; -qt-block-indent:0; text-indent:0px;"><tt> \font
\thisfont = "Arial Unicode MS"</tt></p>
<tt>
</tt>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
margin-right:0px; -qt-block-indent:0; text-indent:0px;"><tt>
\thisfont</tt></p>
<tt>
</tt>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
margin-right:0px; -qt-block-indent:0; text-indent:0px;"><tt> I
appear in black-on-white and am true black (0.0)</tt></p>
<tt>
</tt>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
margin-right:0px; -qt-block-indent:0; text-indent:0px;"><tt>
\vfill \eject<br>
<br>
</tt></p>
<tt>
</tt>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
margin-right:0px; -qt-block-indent:0; text-indent:0px;"> </p>
<tt>
</tt>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
margin-right:0px; -qt-block-indent:0; text-indent:0px;"><tt> \font
\thisfont = "Arial Unicode MS:color=000000"</tt></p>
<tt>
</tt>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
margin-right:0px; -qt-block-indent:0; text-indent:0px;"><tt>
\thisfont</tt></p>
<tt>
</tt>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
margin-right:0px; -qt-block-indent:0; text-indent:0px;"><tt> I
appear in black-on-white and am RGB black (0/0/0)</tt></p>
<tt>
</tt>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
margin-right:0px; -qt-block-indent:0; text-indent:0px;"><tt>
\vfill \eject<br>
<br>
</tt></p>
<tt>
</tt>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
margin-right:0px; -qt-block-indent:0; text-indent:0px;"> </p>
<tt>
</tt>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
margin-right:0px; -qt-block-indent:0; text-indent:0px;"><tt> \font
\thisfont = "Arial Unicode MS:color=FFFFFF" </tt></p>
<tt>
</tt>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
margin-right:0px; -qt-block-indent:0; text-indent:0px;"><tt>
\thisfont</tt></p>
<tt>
</tt>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
margin-right:0px; -qt-block-indent:0; text-indent:0px;"><tt> I
appear in black-on-white and am true black (0.0)</tt></p>
<tt>
</tt>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
margin-right:0px; -qt-block-indent:0; text-indent:0px;"><tt>
\vfill \eject<br>
<br>
</tt></p>
<tt>
</tt>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
margin-right:0px; -qt-block-indent:0; text-indent:0px;"> </p>
<tt>
</tt>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
margin-right:0px; -qt-block-indent:0; text-indent:0px;"><tt> \font
\thisfont = "Arial Unicode MS:color=0000007F"</tt></p>
<tt>
</tt>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
margin-right:0px; -qt-block-indent:0; text-indent:0px;"><tt>
\thisfont</tt></p>
<tt>
</tt>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
margin-right:0px; -qt-block-indent:0; text-indent:0px;"><tt> I
appear in black-on-white and am RGB black (0/0/0)</tt></p>
<tt>
</tt>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
margin-right:0px; -qt-block-indent:0; text-indent:0px;"><tt>
\vfill \eject<br>
<br>
</tt></p>
<tt>
</tt>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
margin-right:0px; -qt-block-indent:0; text-indent:0px;"> </p>
<tt>
</tt>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
margin-right:0px; -qt-block-indent:0; text-indent:0px;"><tt> \font
\thisfont = "Arial Unicode MS:color=FFFFFF7F"</tt></p>
<tt>
</tt>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
margin-right:0px; -qt-block-indent:0; text-indent:0px;"><tt>
\thisfont</tt></p>
<tt>
</tt>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
margin-right:0px; -qt-block-indent:0; text-indent:0px;"><tt> I
appear in white-on-white and am RGB white (1/1/1)</tt></p>
<tt>
</tt>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
margin-right:0px; -qt-block-indent:0; text-indent:0px;"><tt>
\vfill \eject<br>
<br>
</tt></p>
<tt>
</tt>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
margin-right:0px; -qt-block-indent:0; text-indent:0px;"> </p>
<tt>
</tt>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
margin-right:0px; -qt-block-indent:0; text-indent:0px;"><tt> \font
\thisfont = "Arial Unicode MS:color=000000"</tt></p>
<tt>
</tt>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
margin-right:0px; -qt-block-indent:0; text-indent:0px;"><tt>
\thisfont </tt><tt>\color [cmyk] {0.1, 0.2, 0.3, 0.4}</tt></p>
<tt>
</tt>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
margin-right:0px; -qt-block-indent:0; text-indent:0px;"><tt> I
appear in black-on-white and am RGB black (0/0/0) despite the
call to \string \color \space [cmyk] ...</tt></p>
<tt>
</tt>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
margin-right:0px; -qt-block-indent:0; text-indent:0px;"><tt>
\vfill \eject </tt></p>
<tt></tt>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
margin-right:0px; -qt-block-indent:0; text-indent:0px;"><tt><br>
</tt></p>
<tt>
</tt>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
margin-right:0px; -qt-block-indent:0; text-indent:0px;"> </p>
<tt>
</tt>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
margin-right:0px; -qt-block-indent:0; text-indent:0px;"><tt> \end</tt><br>
<br>
</p>
<div class="moz-signature">-- <br>
<img src="cid:part4.AA3824F6.5059B400@Rhul.Ac.Uk"><br>
Philip Taylor</div>
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