[NTG-context] Re: images with alt text

6 Feb 2025


      ...
No. I tested it (and added also the backend stuff) ...
\setupbackend[
format={pdf/a-1b:2005},
profile={default_cmyk.icc,default_rgb.icc,default_gray.icc},
intent=Coated FOGRA39 (ISO 12647-2:2004),
level=0]
\setupstructure[state=start,method=auto]
\setupbackend[export=yes]
\setupexternalfigures[location=default]
...
\starttext
\pdfalternativetext{\externalfigure[cow]}
    {alternate description}
\stopPDFalternativetext
\stoptext
… but when opening the PDF with Acrobat Reader and checking the Document
Properties “Tagged PDF?” it says “No”.
(Even though it is recognised as PDF/A)
Thanks for having tried! I unfortunately know nothing about how
Acrobat Readers checks for a tagged PDF, so I'll refrain from trying to
propose solutions - which would likely not work.

Cheers,
Florent

Le jeu. 6 févr. 2025 à 11:23, Steffen Wolfrum  a
écrit :
...
No. I tested it (and added also the backend stuff) ...
\setupbackend[
format={pdf/a-1b:2005},
profile={default_cmyk.icc,default_rgb.icc,default_gray.icc},
intent=Coated FOGRA39 (ISO 12647-2:2004),
level=0]
\setupstructure[state=start,method=auto]
\setupbackend[export=yes]
\setupexternalfigures[location=default]
\starttext
\pdfalternativetext{\externalfigure[cow]}
    {alternate description}
\stopPDFalternativetext
\stoptext
… but when opening the PDF with Acrobat Reader and checking the Document
Properties “Tagged PDF?” it says “No”.
(Even though it is recognised as PDF/A)
Steffen
Am 04.02.2025 um 16:40 schrieb Florent Michel :
Hi,
It seems that the accessibility page has moved here:
https://wiki.contextgarden.net/Input_and_compilation/Accessibility .
Maybe the last example is suitable?
(It seems to correctly embed the alt text in the pdf; this can be checked
by using the `--nocompression` flag and opening the resulting pdf with a
text editor. Not sure how to have the alt text in the exported html,
though; I'm sure others will be able to advise on that better than I could.)
Best,
Florent
Le mar. 4 févr. 2025 à 14:29, Steffen Wolfrum  a
écrit :
...
Hi,
today my publishers ask for an example of how ConTeXt deals with
accessibility.
I send them a PDF with
\setupbackend[export=yes]
\setupstructure[state=start,method=auto]
What they needed was like
<img src="example.jpg" alt="Example text">
What is the equivalent for this with ConTeXt?
Contextgarden ( https://contextgarden.net/Accessibility) is empty...
Yours, Steffen
...
Am 23.09.2024 um 17:09 schrieb Hans Hagen via ntg-context <
ntg-context@ntg.nl>:
On 9/23/2024 8:02 AM, Pablo Rodriguez via ntg-context wrote:
...
On 9/22/24 21:58, Hans Hagen via ntg-context wrote:
...
On 9/22/2024 2:43 PM, Pablo Rodriguez via ntg-context wrote:
...
It would be great to have synonyms added the /E information by
default.
I think this may be a requirement for text-to-speech conversions.
even more crap .. let's wait till abbreviations are completely
forbiddeb
(and also units and such )
From what I see, /E may be helpful (similar to /ActualText).
Imo it's useless:
(1) normally when a new abbreviation is intriduced one has the expanded
meaning after it
(2) after that it is suposed to be known
(3) if one jumps into a document in the middle one cannot expect it to
be repeated every time
(4) if that *is* expoected there is no need to use abbreviations at all
(5) so, why should a 'read out' document have all abbreviations with an
expanded meaning and a typeset text not
...
For me, the real problem with accessibility (and penalties for
non-accessible documents) is that it will force all documents to be
machine-readable (so we have to feed AI with all our public documents,
whether we like it or not).
i assume that such a machine learning or pattern recognotion app can
quite well figure out that it's an abbreviation
...
I mean, no such as "\enabledirectives[backend.pdf.nounicode=❌]"
allowed.
well, everything is allowed ... after all why do we typeset and
visualize otherwise ... it depends on the audience
one can always generate multiple versions, one with two times the
number of pages and all expanded
Hans
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___________________________________________________________________________________
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If your question is of interest to others as well, please add an entry to
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