[NTG-context] Re: images with alt text

[Pablo Rodriguez via ntg-context <ntg-context@ntg.nl>]

On 9/22/24 13:15, Hans Hagen via ntg-context wrote:
> On 9/21/2024 7:16 PM, Steffen Wolfrum wrote:
>> Hi,
>>>> as publishing houses (at least in Germany) are forced to provide
>> «alt text» with their PDF-publications (from June 2025 on),

Hi Steffen and Hans,

this will be a requirement for the whole European Economic Area. This is
where the Accessibility Directive should be applied.

Since this may not be the single requirement, I started a new wiki page
for that: https://contextgarden.net/Accessibility.

Please, feel free to contribute (as ever).

>> What is the equivalent in ConTeXt LMTX?
>
> afaik there no such tag on an image in pdf so one has to wrap, i'll add

Alternate descriptions are covered in
https://opensource.adobe.com/dc-acrobat-sdk-docs/pdfstandards/PDF32000_2008.pdf#nameddest=G13.2262140.

From what I see in the sample, they are very similar to /ActualText, but
with /Alt instead (related to a marked section).

They are applied to all items that have no direct text translation, such
as images or formulas (to alternatively describe them in text).

>      \startPDFalternativetext{when will the german government provide
> full acrobat for free (livelong) to developers}
>          \scale[s=3]{\rotate[rotation=30]{DE}}
>      \stopPDFalternativetext
>
> to play with but integrating something more nice also will b emore
> confusing ... the problem is that anything can be an image (liek a mp
> picture)

I  think this is great, since this allows it to be applied as allowed by
the PDF spec.

Also for the expansion of abbreviations, /E is provided for marked
sections
(https://opensource.adobe.com/dc-acrobat-sdk-docs/pdfstandards/PDF32000_2008.pdf#nameddest=G13.2260327),
the same way as /ActualText (but it expects whole words).

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.

Many thanks for your help,

Pablo
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