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Invisible empty Images in accessible PDF - bug? fix?


From: Christine Hogenkamp
Date: Apr 29, 2020 12:22PM

Hello everyone,

I am working on an accessible PDF that I am creating from an InDesign file
that was given to me to arrange for proper accessible PDF publishing (ie
tagging elements, add alt text, etc) and overall the doc passed the Acrobat
Full Check except for a few items flagged under "Other elements alt text -
Failed" which I am not sure if it's a bug or why I can't seem to get it
fixed using the normal Acrobat methods.

Acrobat is detecting a handful of empty Images without alt text that come
first on a few pages that are not present in the InDesign doc (literally
does not show in the Layers panel, no stray text boxes/vector, etc), but
also can't be visually seen on the page itself when using the Reading Order
panel (the page numbering starts at 2, and 1 is not visible anywhere). When
these invisible Images are selected and the right-click option Delete
Selected Structure Item is chosen for the Image, nothing happens. They
won't let themselves be deleted, which leads me to believe they are a bug
of some kind happening when publishing the PDF.

Any thoughts or suggestions for a fix? I am prepared to tell the client to
just ignore them, seeing as the Full Check has other items that we know
usually get flagged but are correct in the document, and these empty Image
elements don't seem to affect screen reader or keyboard navigation, but I'd
like to know how to prevent this from happening in the future if possible.


*Christine Hogenkamp*
Front-end Developer