Improving existing PDF image quality without losing text

I have finished PDFs, the result of an OCR process that produced text under image files. I would like to modify the lighting of the images without changing the text part of the PDF. Is this possible in any version of Acrobat Pro? And, if so, which version and how is it done?

I tried to do that, but I can't get Photoshop to deal withn the whole document--only single pages. and the document is over 200 pages long. I can save the PDF images in some image format and edit the batch, but then I can't get them reconnected to the text. (I have used batch processes in Photoshop, but it won't regard the PDF document as a batch.) So, I seem stuck wither way. It seems as if there is no way to improve images in a text-under-image PDF while using Acrobat Pro--which was my original question.
If there is a way that any one knows about, I would love to hear about it.

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Improving existing PDF image quality without losing text

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