You are trying to use Reader in ways unintended. The text behind the image of the pdf exists for searching purposes not for copy and pasting. If you had Acrobat you could try to use the OCR capability and then save the document as a word or rtf file. When this is done, the output is sometimes usuable sometims not worth the effort. Each version of Acrobat has improved its OCR capability. If you have images you wish to convert to text, you are best of using a dedicated OCR program.
Many thanks, Michael.
On the face of it, yes, but in fact I had turned my email around to show effect before cause; the phenomenon actually means that Adobe Reader is unable to search the pdf yet searching is the intended purpose of Reader, as you say.
In contrast, other readers such as Foxit and NitroPDF are able to search the pdf.
Yet, behind the scenes, Reader has correctly picked up all the words as demonstrated when it outputs into the other formats I mentioned. I do have a range of dedicated OCR programs but in this case I do not wish to convert my images to text, merely to view and search them. I was "exposing" the text, specifically copying and pasting, to show the cause of Reader not picking up the search terms.
Please do let me have your further thoughts, Michael and/or others, and just let me know if you require any further information.
This issue is already fixed in Acrobat 11. Unfortunately, we are unable to resolve it for Acrobat 10.