Darkening the text on a scanned image pdf, but not the background?

Hello everyone,

 

I'm working on a document that is a scanned image file from an old public domain source. My test copy that I recieved was readable, but there were parts that seemed faded a bit. I can't ask for much better with an old scanned image file, but-

 

Does anyone know a way to darken only the black portion of a scanned image file, and leave the white portions white?

 

Thank you very much!

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