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Originally Posted by thibaulthalpern
It's inaccurate to say PDF is a picture of every page. Usually the text is actually text.
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Not really. The text is still a picture, but a PDF usually has an additional text-only layer that the readers can use for plaintext rendering. Unfortunately, this text layer is often just an uncorrected OCR of the image and can differ quite significantly from the "image representation".
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I don't think this is so much a PDF issue as it is a problem with digital readers.
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You are mistaken. The readers handle it about as well as they can, but if the PDF is formated for A4 and the text layer is crap, there is not much they can do.