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Originally Posted by _Rodrigo_
So, I am using Calibre to convert them to EPUB. Unfortunately, with some books, some letters were exchanged for others, much like OCR sometimes does.
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Calibre doesn't do OCR. If you have a pdf that has a word in it like "find" and you convert it, then see the word "fmd," then the word "fmd" was in the original pdf. What happened is this: The original pdf was a scanned image. Someone later ran the pdf through an OCR. Adobe Acrobat has that capability. When you read the book as a pdf, you saw the scanned image and the words looked correct. If you had searched for the word, however, you would not have been able to locate the word "find," only the word "fmd." When Calibre converts, it uses the OCR words, not the images.
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All this preambule is to kindly ask you if is there any thing I can do to help improve the quality of the pdfs I input to Caliber.
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You need a better OCR on the images, or you need to proof them first.