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Hi Zdenek,
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<div class="">On Jul 11, 2016, at 7:03 PM, Zdenek Wagner <<a href="mailto:zdenek.wagner@gmail.com" class="">zdenek.wagner@gmail.com</a>> wrote:</div>
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<div class="">As I found, it is not necessary to be fully PDF/X compliant, in some cases even PDF 1.5 is acceptable. It is a matter of negotiation with the printer what they accept and what they do not. The good companies are able to visualize the output without
actually printing it so it is possible to check. and they can make the proof available on their web and send the private link to the customer.
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<div>Exactly.</div>
<div>For Phil’s book it would be good to know precisely what the printers have requested.</div>
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<div>But for general usage into the future, we want the most flexible package that</div>
<div>can be written, to cope with all the identifiable variables.</div>
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<div class=""> even though the page stream is clearly not compressed:</div>
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<div style="margin:0px;font-size:11px;font-family:Menlo" class="">5 0 obj</div>
<div style="margin:0px;font-size:11px;font-family:Menlo" class=""><</Length 117>></div>
<div style="margin:0px;font-size:11px;font-family:Menlo" class="">stream</div>
<div style="margin:0px;font-size:11px;font-family:Menlo" class=""> q 1 0 0 1 72 769.89 cm BT /F1 9.9626 Tf 19.925 -9.963 Td[(Hello)-333(W)82(orld!)]TJ 211.584 -654.747 Td[(1)]TJ ET Q</div>
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<div style="margin:0px;font-size:11px;font-family:Menlo" class="">endstream</div>
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<div class="">Fonts in that PDF do use compression.</div>
<div class="">The only other thing compressed is the XRef table.</div>
<div class="">When Acrobat is asked to convert to PDF/X the xref table is uncompressed;</div>
<div class="">so that figures to be the real issue here. <br class="">
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</span>Interesting. I get no such complaint for any of the 302 pages, but neither am I asking Acrobat to convert the PDF to PDF/X (I would not know how to) -- all I am asking Acrobat to do is (a) convert the colour space, and (b) reduce the file size while
making the PDF Acrobat 4+ compatible. At the end of these two processes, Acrobat 7.1 pre-flight tells me the result is fully PDF/X-1A:2003 compliant<span class=""><br class="">
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<div>OK. But this is after using Acrobat, yes?</div>
<div>Not before.</div>
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<div class="">pdfx.sty can do it but it makes use of hyperref which I do not like because it is a big package. My document containing English + Hindi crashed with one version of hyperref but I was unable to prepare a minimal example in order to write a useful
bug report. It would be nice to have an interface for preparation PDF/A and PDF/X without Acrobat.
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<div>Can you send me any file that shows this?</div>
<div>I’m not interested in just MWEs, but real-world examples.</div>
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<div>So far I can generate Metadata in Cyrillics, Greek, Armenian, Hebrew as well as latin-based languages.</div>
<div>At some point I plan to tackle Indic scripts as well.</div>
<div>So English + Hindi is an attractive challenge. </div>
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<div class="">Anyway, I never include an ICC profile. I just convert the colours to CMYK using the right profiles and the resulting colours are exactly as I wanted.
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<div>It’s not clear to me how important a CMYK profile really is for TeX-generated material.</div>
<div>Mostly the CMYK colors are given algorithmically from RGB coordinates,</div>
<div>so RGB would probably suffice anyway.</div>
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<div>Of course it’s a completely different story for artistic works, photographic or otherwise.</div>
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<div class="">4. The \special {pdf: docinfo << … } while valid, is *not* the recommended way to
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<div class=""> The modern way is via XMP which is an XML stream using uncompressed UTF-8 encoding.</div>
<div class=""> Some docinfo fields can be included also, provided they agree *exactly* with what</div>
<div class=""> is in the XMP packet. For things like multiple authors, and more than one Keyword entry,</div>
<div class=""> it is best to put them into the XMP *only*.</div>
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<div class=""> Again, with PDF/X-4 and higher, this is flagged as an issue.</div>
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</span>Again, this is Hyperref's default behaviour; Acrobat itself then adds the XMP stuff when it saves the file.<span class=""><br class="">
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<div class="">pdfx.sty can do it<br class="">
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<div class="">What I dislike is that pdfx has A4 size hard-wired, zwpagelayout.sty calculates the boxes based upon \paperheight and \paperwidth (without using eTeX and lua, just the old dimen registers arithmetic).<br class="">
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<div>Not in v.1.5.8 — at least not for PDF/X.</div>
<div>That was a specific request which I responded to.</div>
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<div> pdfx.sty has no coding about this for PDF/A, so far as I can see.</div>
<div>Maybe it’s another of the things that hyperref does, which needs </div>
<div>to be over-ridden. I’ll look again more closely tomorrow.</div>
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<div class="">All of these issues are addressed, also for XeLaTeX, in the latest version (1.5.8) </div>
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<div class=""> <a href="https://www.ctan.org/pkg/pdfx?lang=en" target="_blank" class="">https://www.ctan.org/pkg/pdfx?lang=en</a></div>
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<div class="">The package itself implements everything, (including ensuring that the correct color spaces are used) </div>
<div class="">and the documentation explains how to specify the (external) Metadata that you may wish to provide.</div>
<div class="">It has a sub-section discussing the limitations when using XeTeX as engine.</div>
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</span>Hmmm. Past experience suggests that LaTeX packages are no easy to get to work in a Plain context, but if I look at the \specials emitted that may well provide key information. I know that this particular stable door was closed over 20 years ago, but
I still wish that LaTeX were far far more modular than it actually is. If only one could have a trivial wrapper such as Miniltx and then /any/ package could be used from within a Plain framerwork, how wonderful life would be.<span class=""><br class="">
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<div class="">Especially this one, it depends on a lot of files. I wanted to extract ideas how to build the XMP, how to include the ICC but I gave up.
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<div>XMP is done via a template file; e.g. pdfx.xmp or pdfa.xmp .</div>
<div>There are many places where information can be supplied, via macros</div>
<div>such as \xmp@Subject and \xmp@Author .</div>
<div>Much of the pdfx package is about supplying values for these, in UTF8 encoding.</div>
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<div class="gmail_signature" data-smartmail="gmail_signature">Zdeněk Wagner<br class="">
<a href="http://ttsm.icpf.cas.cz/team/wagner.shtml" target="_blank" class="">http://ttsm.icpf.cas.cz/team/wagner.shtml</a><br class="">
<a href="http://icebearsoft.euweb.cz/" target="_blank" class="">http://icebearsoft.euweb.cz</a></div>
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Cheers</div>
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<div class=""><span class="Apple-tab-span" style="white-space:pre"></span>Ross</div>
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