I am developing a flyer that will be distributed as a PDF, and our requirement is that it be "Section 508" compliant, that is, readable by a screen reader. I am trying to add alt tags to the images in order to meet this requirement, but when I go to Object -> Object Export Options and click on the Alt Text tab, theAlt Text Source pull-down menu is greyed out and does not allow me to do anything.
Does anyone have any idea of what is wrong here?
It's working for me in the current version of InDesign CC.
Version of InDesign? Computer platform? What file format is the image in?
Have you tried restoring your InDesign preferences? Here's how:
I am using InDesign CS6 on a Macbook Pro running OS X 10.9.3, and all of the images are JPGs. I trashed my preferences per your suggestion, and it fixed my problem. I can now add the alt text to the images no problem; many thanks!