How can I change the dark places in a pdf document?

How can I change the dark places in a pdf document? I xeroxed pages of a book, and photocopies are not great quality - many shadows where the book open on the copier glass.

When I had scanned photocopies, dark places to black deep and made the texts scanned / almost illegible xeroxed.

How can I lighten images in PDF files so that the text is readable again?

Depending on your version of Acrobat. see if anything in these Articles help

Tags: Adobe

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