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Here are some examples of what we mean, in order of accessibility from worst to best.
This is an improperly rotated, poor-quality scan of a scribbled-on book. This will be unusable.
If your PDF looks like this: please rotate it and/or find a cleaner version.
This same article has been rotated. The problems are that it has margin notes and has been marked up. See video below for how difficult it is for a text-to-speech program to read the text.
If your PDF looks like this, please find a cleaner version.
A better-quality scan of a clean copy of a book that has each individual book page as its own page in the document. This is much easier to work with and should have a good chance at decent text recognition.
If your PDF looks like this: you are in good shape.
The holy grail, which is a born-digital verison of the reading. This will have near-flawless text recognition and will be easily navigable by the student.If your PDF looks like this, it's perfect.See how Kurzweil, a text-to-speech program, interacts with these PDFs!