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Character limit on alt-text in PDF?

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From: McMorland, Gabriel
Date: Jun 28, 2013 12:43PM


Is there a character limit on the alt-text for images in PDFs?
If not, then how long is too long?

Also, where do you usually put long descriptions for complex images in PDFs hosted on a website? If it was HTML I could use longdesc, but I'm not sure where to put them with the PDFs used in our online courses.

Thanks for your thoughts,
Gabe