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.ha...@xs4all.nl> wrote:
>
> On 7/9/2020 9:08 AM, Taco Hoekwater wrote:
>>> On 9 Jul 2020, at 08:32, Hans Hagen <j.ha...@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
>
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