Levels and contrast to PDF

I have 300 page pdf file which was poorly scanned.I downloaded it so adjusting scanner settings is not an option.And is not my intension to print them myself so I cannot adjust the printer settings.How can I improve quality to all pages without going trough each page.My intension was to make some adjustment layers on top but photoshop is rasterising the pages all in 1.

How can I improve quality to all pages without going trough each page.
Probably not at all. If the white balance is different on each of them, each will require a different adjustment setting and if there is additional dirt, dust and noise, this will further complicate matters. At best, you could do this with extensive scripting and some of the pseudo-smart adjustments like auto-levels, but even then it may not turn out as what you expected. As already hinted at by C. Pfaffenbichler, this might be a bit easier to do in InDesign and making use of its live adjustment options for images, but you'd still have to deal with each of them separately. The only advantage would be that you can work with a solid file and can retain the document structure instead of dealing with hundreds of separate image files. in any case, regardless of what program you use, all of this would depend on the PDF actually producing clean page images, which may not be the case at all if e.g. it has been optimized for file size and thus images sliced up into tiles...
Mylenium

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