[tex-live] ICC profiles for PDF/A compliance

[Ross Moore]

Hi Reinhard, Karl and others.

On 11 Sep 2018, at 8:38 am, Reinhard Kotucha <reinhard.kotucha at web.de<mailto:reinhard.kotucha at web.de>> wrote:

On my Raspberry I just installed the Debian icc-profiles-free package
and now there is a file

 /usr/share/color/icc/ghostscript/srgb.icc

If Debian considers ghostscript/srgb.icc as free, isn't it free enough
for TeX Live as well?  The file contains

 "Copyright Artifex Software 2011"

Is this license appropriate for TeX Live?  I think so because
otherwise neither Debian nor TeX Live can provide Ghostscript.

Debian also provides a file

  /usr/share/color/icc/sRGB.icc

which obviously comes from LCMS and contains

 "no copyright, use freely"

Nicely said.  Sounds like "public domain" at a first glance.  But who
is the author and where does the stuff come from?

After all, I think that if all GNU/Linux distributions already provide
Ghostscript, there is no obvious reason not to ship a file which is
part of it with the pdfx package.

Probably best is to ship a copy of this (i.e., one of these – which one?)
in the  …/tex/latex/pdfx/  directory.

Another possibility is to specify the full path to it, where needed in
the source of  pdfx.sty .
The problem with this is that it needs to work on all platforms, so the
syntax of the path (or the path itself) could be different.
Maybe Ghostscript isn’t even installed in some cases, since GS normally
isn’t needed when pdfTeX is the engine ?


But there is one aspect of this that I don’t have the expertise in color usage to decide.
How different are the various profiles?
What is the difference between them? Does it matter?
If we make a choice, then there should be a reason for it, concerning the actual
colour output, either on-screen or when printed with different devices.

It would be good to have some explanation included within the  pdfx  documentation,
addressing this issue. That is, saying when it is best to stick with the default,
and when it is advisable to apply a different Colour profile, perhaps with some
examples of when alternatives are either useful or needed.

Who can help with this?


Regards,
 Reinhard

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Reinhard Kotucha                            Phone: +49-511-3373112
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Cheers.

Ross



Dr Ross Moore

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