Hi Max,
I ran Ghostscript on both the accessible and the untagged version of my file,
and
I am getting the following in both cases:
p. 151:
WARNING: pdfi_create_indexed() got 6 values, expected at least 9 values
WARNING: Image has unsupported ColorSpace (not a name)
The following errors were encountered at least once while processing this file:
error executing PDF token
circular reference to indirect object
error in image colour
The following warnings were encountered at least once while processing this
file:
recoverable image error
garbage left on stack
Page 151 is one of the critical pages that consistently crashes Preview on the
Mac (but only in the accessible version).
I regularly use PDF images created/edited with Illustrator, and I leave the
Illustrator fork in the PDF. p. 151 contains one of them, but there are many
others in that file.
Matthias
> On Nov 17, 2025, at 7:50 AM, Max Chernoff via ntg-context
> <[email protected]> wrote:
>
> Hi Matthias,
>
> On Sun, 2025-11-16 at 13:50 -0500, Matthias Weber wrote:
>> That I have not been able to figure out: All viewers I have tried on
>> my Mac crash when opening large PDFs that are compiled this way,
>> typically when I reach a page that contains a figure.
>>
>> With one exception: Acrobat. I don’t know whether it’s ConTeXt or the
>> readers that struggle with accessible PDFs.
>>
>> It also only happens with larger PDFs (50+ pages, maybe)
>>
>> The viewers work fine when I compile the files without the
>> accessibility preamble.
>
> Does GhostScript show any errors/warnings if you run it on one of the
> PDFs?
>
> $ gs -dNOPAUSE -dBATCH -sDEVICE=nullpage <filename>.pdf
>
> If there are any errors, then that's probably the source of the problem
> (and so should theoretically be fairly easy to fix); if there aren't any
> errors, then it'll probably be trickier to figure out what exactly is
> causing the crashes.
>
> Thanks,
> -- Max
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