Take the 2-minute tour ×
Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

Some PDFs are scanned at horrendous quality yet seem to overlay this over actual text. I'm not exactly sure how this happens but I suppose an example is worth a thousand words. See this pdf:

http://www.cs.utexas.edu/~shmat/courses/cs380s/prudent.pdf

Notice the terrible quality. However, if you select the text (tested in "Document Viewer 2.30.3", which is evince I think) by dragging the mouse over it or just Ctrl-A'ing it, suddenly the text is all clear. How do I remove the terrible quality overlay and just see the text?

Edit: screenshots

Original

versus

Selected

share|improve this question
1  
I don't think it's so much of an overlay as much as OCR'd text. Highlighting it certainly doesn't change anything about the text (other than highlighting it) for me. –  Rob Oct 25 '11 at 16:09
    
added screenshots of what I see. @Rob if it's OCR, then that's what I'd like to see rather than the "actual content" –  Mala Oct 25 '11 at 16:56
add comment

1 Answer

up vote 2 down vote accepted

Have a look at this SU answer describing how to make invisible fonts visible.

I applied the same method to your file 'prudent.pdf'.

share|improve this answer
add comment

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.