> Am 12.10.2021 um 20:48 schrieb Hans Hagen <j.ha...@xs4all.nl>:
>
>> Hm, you implemented these boxes only in 2015, there was not much change in
>> that regard since then.
>
> Way earlier but it wasn't enabled ... (I'm not going to check ancient tex
> live dvd's).
>
> addtopageattributes("CropBox",box) -- mandate for rendering
> addtopageattributes("TrimBox",box) -- mandate for pdf/x
> -- addtopageattributes("BleedBox",box)
> -- addtopageattributes("ArtBox",box)
>
> I remember discussing it with (I think) Pablo and it definityely came up when
> we were dealing with these 'standards'.
Ok. I found it in lpdf-mis.lua, maybe I’ll use the Lua function directly.
>>> well, that's an assumption ... who knows what a printer (driver) does ...
>> Who sends PDF files directly to a printer (driver)? I know it only from
>> automated, professional workflows.
>> Usually printer drivers gets fed by PDF viewers, and I know none that even
>> *can* print something different than CropBox.
>
> afaik some printers accept pdf (hard to check) but I the fact that a viewer
> does something doesn't mean it did years ago (just like at how crippled
> tounicode has been / is supported over time)
Yes, you can send PDF files to some copiers and other professional printing
devices. But usually you do this via the manufacturer’s workflow tools – only a
few admins still know how to (ab)use a prn queue ;)
>>>> Beware, \setupbleeding refers only to stretching of images
>>>> (\externalfigure)!
>>>
>>> fwiw, that bleeding options is mostly there to communicate with mp
>> Good to know. I just browsed the Details manual, didn’t try it yet, since I
>> scale and move my “bleeding” images differently.
>
> i actually need to pick up that bit ... (some code in my local styles i need
> to check) because it can be handy for cover pages (but then i also need to
> check if i don't break something
I’d be interested to see what you’re trying.
I want to create my covers more and more with ConTeXt to avoid manual adaptions
due to number of pages.
>>> the problem is as usual documentation and indeed we can have some backward
>>> compatibility issue here ... i honestly have no clue how viewers and
>>> printers react (so if something would be added/changed it would be option
>>> driven)
>> I wouldn’t expect printers (office printing devices) to react at all; I hope
>> that printers (printshop workers) will react positively to correct boxes in
>> our PDFs ;)
>
> oh, i'm often surprised about printing houses .. (the best were some comment
> on a file having rgb bitmaps while it actually had cmyk outlines and
> validators/fixers inlining xforms while setting lines to 0pt widths) .. and
> some still use acrobat 4 -)
Yep, last weekend I finally sent the latest issue of our magazine to the
printshop, of course with correctly set boxes (and markings activated), and
since the content didn’t need bleed this time, I set the CropBox to TrimBox.
Everything in perfect order – but they charged me for adding crop marks...
(Without even asking back.) I’ll teach them PDF basics.
BTW, is there a hook to replace crop marks with my own?
Ah, found page-mrk.mkiv
Can I just replace \startuniqueMPgraphic{print:lines} ?
(Something to play with if I get into MP mode...)
>>> probably spreads need some treatment (imposition)
>> Multiple pages on a sheet are not considered by the PDF specs.
>
> yes but what of context imposes
Right. IMO, if there’s a BleedBox defined, ConTeXt should use it as “page
size”, otherwise CropBox.
> remind me in a few months (it's a typical boring winter evening activity with
> some music blu ray (or movie) running on a second screen)
I’ll never understand how others can work with such distractions ;)
Hraban
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