<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
</head>
<body text="#000000" bgcolor="#FFFFFF">
<div class="moz-cite-prefix">Ross Moore wrote:<br>
<br>
</div>
<blockquote type="cite"
cite="mid:74C474AD-2652-4C17-844C-7369945B4816@mq.edu.au">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
Hi Philip.<br class="">
<div><br class="">
<blockquote type="cite" class="">
<div class="">On 20 Jun 2020, at 12:08 am, Philip Taylor <<a
href="mailto:P.Taylor@Hellenic-Institute.Uk" class=""
moz-do-not-send="true">P.Taylor@Hellenic-Institute.Uk</a>>
wrote:</div>
<br class="Apple-interchange-newline">
<div class="">
<div text="#000000" bgcolor="#FFFFFF" class="">XeTeX does
what is expected if one uses \special {background cmyk
0.83 0.82 0.21 0.60} and ships out pages in the normal
way; however, if \shipout is invoked directly, the shipped
out boxes have a transparent ground. How should the
background colour of boxes which will be shipped out
directly be specified ?<br class="">
</div>
</div>
</blockquote>
<div><br class="">
</div>
<div>You need to understand that “background color” is *not* a
basic concept in the PDF graphics model.</div>
<div><br class="">
</div>
<div>see the discussion at this link (and elsewhere), as shown
in the image below:</div>
<div> <a
href="https://community.adobe.com/t5/acrobat/change-background-color-of-pdf-pages/td-p/8476774?page=1"
class="" moz-do-not-send="true">https://community.adobe.com/t5/acrobat/change-background-color-of-pdf-pages/td-p/8476774?page=1</a><br>
</div>
</div>
</blockquote>
<br>
OK, thank you for that information Ross. Clearly I was unaware of
that, but the discussion was not particularly helpful, especially
those who advocated using the Adobe Reader/Acrobat GUI to change the
colour-scheme to "accessible" ! But in most ways I am no wiser — I
have still have no idea why \special {background cmyk c.c m.m y.y
k.k} can change the colour of pages shipped out from the output
routine but not via a direct shipout. It is not as if \special
{background cmyk c.c m.m y.y k.k} is inserted as a part of the
output routine — it is in mainline code. So, why does it affect
only pages that pass through the output routine ?<br>
<br>
** Phil.<br>
</body>
</html>