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Why the visual quality of the pdf page becomes worse after OCR?

After making OCR to a pdf document I save it as pdf. But I notice that the quality of the document becomes poor. Why is that as I need only to add a text layer to the original document? Can anything be done with it?

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    Nina Blokhina

    Hello Peter, I created a Support ticket for your question. Please expect an email from us.

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    Steve Joberson

    I have this exact same question: I created a PDF from a bunch of JPEG files using another program. I open it and it looks great, but it's not searchable.  So thought I'd give FineReader a try since it can OCR and create the text layer. But the problem is, the output PDF looks terrible even when choosing a custom 100% image quality setting. I don't know how this stuff works, but there should be a way to have FineReader simply create and save the text layer and not do ANYTHING to the existing PDF quality or format.  Instead, it looks like it's taking the OCR and "re-writing" the PDF and it looks really lousy.

    Please advise or I'll have to find another software package...

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    Victoria Dvornikova

    Hi Steve Joberson,

    In FineReader PDF 15 (current version) you can open PDF file in PDF editor and select in menu Recognize > Recognize document. In this case the quality of the file won`t be changed.

    In OCR Editor you can try to use the image settings as below (menu Tools > Options > Format Settings):

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