There, the only possible color change of image-based pdf-s is inverting colors with viewers that have that option: Evince, Qoppa-PDFStudioViewer), xpdf (with the -rv argument, see here), mupdf ( here). paper that was scanned) the pages will in many cases show paper-like black-on-white text (even if images are extracted and converted to an ebook format as said here). In case the available text is a pdf formed of images (e.g. With most of the tools already mentioned under this question, only pdf files made out of text files (and not of scanned/photocopied text saved as image) can be treated so that colors of page and fonts (or at least of page, as expected by the OP) are changed.
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