Juan Antonio Mayol wrote:
> Hi,
> 
> I have a pdf created with Adobe Acrobat 9, I am trying to access the 
> alternate text for images of this document, but always appears as null.

Read the PDF Reference or ISO-32000.
The alternative text isn't part of the image bytes!
Alternative text is added using the concept of marked content.
It's beyond the scope of the mailing list to explain this concept,
as it would take too much time to do this for free.
-- 
This answer is provided by 1T3XT BVBA
http://www.1t3xt.com/ - http://www.1t3xt.info

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