[XeTeX] [tex-live] Seemingly inexplicable shift in page origin between TL 2014 and TL 2016

[Ross Moore]

Hi David,

On Jul 15, 2016, at 4:47 PM, David Carlisle <d.p.carlisle at gmail.com<mailto:d.p.carlisle at gmail.com>> wrote:

Is there a mechanism similar to  \hypersetup  that allows the options to be changed
*after* the package has been loaded?

Not really, although the actual setting is in \AtBeginDocument{\AtBeginDVI  so as long
as you set the relevant registers to the right value it'll get set up (but let me know if you need more hooks)

No, I don’t need any more hooks.
A previous message explained why.

There is a very minor issue, as follows.

PDF/X generally requires CMYK color space, whereas PDF/A and PDF/E usually use RGB colors.
If one specifies  \pagecolor{yellow}  say, then it will use whatever color space was stated
when ‘yellow’ was defined as a color.
This would lead to a validation problem if it wasn’t the same space as the PDF type requires.

The “fix” for this is to use the  xcolor  package, and force conversions into the right color space.
Thank you for writing this, so many years ago!

Currently  pdfx.sty  force loads  xcolor   for PDF/X.
For some reason the command with PDF/A was commented-out, so that  xcolor would be loaded
only if requested by the document author, as per usual.
(I must have been testing something and didn’t uncomment it before releasing the package;
or maybe I thought more tests were needed, and just forgot about it.)

I do, however, put in a check that prevents the author from using the wrong color space.

The next version of  pdfx.sty  will force loading of  xcolor  in all situations, since there’s
no easy way of knowing what or when the author might request colours.


What is the issue?
  xcolor  can be very noisy:
viz.

Package xcolor Warning: Incompatible color definition on input line 3993.

[48]][48

Package xcolor Warning: Incompatible color definition on input line 4027.


Package xcolor Warning: Incompatible color definition on input line 4101.


Package xcolor Warning: Incompatible color definition on input line 4115.

[49]][49

That's 3 warnings per page.
Fortunately the final result is fine, passing validation.

xcolor  has an option  hideerrors  but this doesn’t suppress these warnings.



Cheers

Ross


Dr Ross Moore

Mathematics Dept | Level 2, S2.638 AHH
Macquarie University, NSW 2109, Australia

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