I have Adobe Reader X. It has commenting tools. I
created a PDF file by scanning another docu
ment (a newpaper clipping) to the PDF file for an attachment to an Email. I am not able to use the highlighting tool on the new PDF document. Since I was the author of the PDF document in this case (but obviously did not use Adobe Acrobat to create it), can I somehow enable use of commenting tools for the document?
The highlight tool works for highlighting text that is in the document (as text objects). Images of text, which is what you get with a scan, cannot be highlighted with this tool, even if you had Acrobat.