From: Gerben Wierda <gerben.wierda@rna.nl>
To: mailing list for ConTeXt users <ntg-context@ntg.nl>
Subject: Re: Minimum METAPOST code produces problematic PDF
Date: Thu, 9 Jul 2020 14:07:39 +0200 [thread overview]
Message-ID: <70BB305F-BF84-4757-85CC-E0C52D585229@rna.nl> (raw)
In-Reply-To: <4d1e9138-6bca-987c-6ff1-f31270d15c56@xs4all.nl>
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The minimum is a relative one:
It is page 650 in the (normative) Annex C Implementation Limits for PDF readers and writers:
Additionally, conforming writers should adhere to the following constraints, and conforming readers should accommodate PDF files that obey the constraints.
The minimum page size should be 3 by 3 units in default user space; the maximum should be 14,400 by 14,400 units. In versions of PDF earlier than 1.6, the size of the default user space unit was fixed at 1⁄72 inch, yielding a minimum of approximately 0.04 by 0.04 inch and a maximum of 200 by 200 inches. Beginning with PDF 1.6, the size of the unit may be set on a page-by-page basis; the default remains at 1/ 72 inch.
In other words: you need to change the unit per page so the page is at least 3x3 and maximally 14400x14400.
> On 9 Jul 2020, at 12:10, Hans Hagen <j.hagen@xs4all.nl> wrote:
>
> On 7/9/2020 9:08 AM, Taco Hoekwater wrote:
>>> On 9 Jul 2020, at 08:32, Hans Hagen <j.hagen@xs4all.nl> wrote:
>>>
>>> On 7/8/2020 8:14 PM, Gerben Wierda wrote:
>>>> I found out this in the PDF spec:
>>>> The minimum page size should be 3 by 3 units in default user space; the
>>>
>>> I never noticed that ... what section/paragraph in the spec?
>> It’s in the implementation limits for Acrobat, not in the normative section.
>
> Great. That used to be 1 bp so now it's more. As it happens, we do have a check for this in context so we can adapt it ... but, as this 3 bp is kind of arbitrary and because 3 bp becomes a float and thereby ends up slightly less than the integer 3 we can best play safe and revert to the usual tex joke, so i now set the minumum to
>
> \luaexpr{math.pi}\onebasepoint
>
> which then gives:
>
> /MediaBox [ 0 0 3.141539539 3.141539539 ] because after all, any rediculous minimum will do and that way a user can still figure out that it's a value set by context.
>
> Hans
>
> -----------------------------------------------------------------
> Hans Hagen | PRAGMA ADE
> Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
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___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!
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next prev parent reply other threads:[~2020-07-09 12:07 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-07 22:49 Gerben Wierda
2020-07-07 23:08 ` Jairo A. del Rio
2020-07-08 18:14 ` Gerben Wierda
2020-07-09 6:32 ` Hans Hagen
[not found] ` <FA33AC5F-7924-460A-9669-2E14687A0745@elvenkind.com>
2020-07-09 10:10 ` Hans Hagen
2020-07-09 12:07 ` Gerben Wierda [this message]
2020-07-09 6:37 ` Aditya Mahajan
2020-07-11 12:22 ` Gerben Wierda
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