[NTG-context] Re: Alternate text for images?

5 Apr 2025

      Hi Pablo,

Thanks, but no, that doesn’t work. 

Acrobat reads the document by just warning that the page is empty.
While the report comes back mostly ok.

When I ask it to “add tags”, it tells me it will go through the document, detect all images, and display their tags, but then it says that there are is no figure information to display.

The tag report list that lists all accessibility tags identifies the figure as <NonStruct> with information PathPathPathPathPathPath.

Below is the generated report.

Thanks!

Matthias
...
On Apr 5, 2025, at 3:05 AM, Pablo Rodriguez via ntg-context  wrote:
On 4/4/25 22:10, Matthias Weber wrote:
...
I listened to the German document. The picture at the top is read as
“Bundesadler”, so an alternate text is found and used. The rest is
just verbatim text-to-speech.
Hi Matthias,
I think the following may work (could you test it?):
\setupbackend[format=pdf/ua-1]
   \setuptagging[state=start]
   \setupstructure[state=start]
   \setupbackend
     [format=PDF/A-3a,
      intent=sRGB IEC61966-2.1,
      level=0]
\setupexternalfigures[location=default]
   \starttext
   \externalfigure[cow][label={this is a cow}]
   \stoptext
At least, the validator only complains for the use of /DocumentFragment
(unknown to PDF-1.7).
BTW, the use of \setupbackend is mandatory when you add images (these
are color profiles).
...
Acrobat can also create an accessibility report, which I am attaching.
Many thanks for that, it would be great to have something like that when
all main issues with accessibility are solved.
Manny thanks for your help,
Pablo
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!
maillist : ntg-context@ntg.nl / https://mailman.ntg.nl/mailman3/lists/ntg-context.ntg.nl
webpage  : https://www.pragma-ade.nl / https://context.aanhet.net (mirror)
archive  : https://github.com/contextgarden/context
wiki     : https://wiki.contextgarden.net
___________________________________________________________________________________