I have noticed that, when trying to open a pdf, ebook readers run pdftohtml tool. The quality of pdf display in an ebook reader may depend on the pdf too.
Color settings are accessed by opening a book, right-clicking, then selecting Preferences - Colors. Poor pdf text rendering in the document tested by me - sometimes lacking spaces between words and wrong display of non-English accented characters.Ĭalibre's Ebook Viewer - better rendering of pdf text (very few problems with the same document tested in Bookworm). I have tested only two:īookworm - it has 3 color profiles but each profile can be edited (fully adjustable colors for background and fonts under Preferences).
As far as I can tell they do not display the text as well as a pdf viewer in all cases. Most eBook readers offer color settings for page and font, but only some of them can open pdf documents. Having a large white area on the screen all the time comes against the purpose of improving readability, so I prefer other solutions.
Foxit Reader for Linux has the option of changing both the color of background and of text - either by selecting a color profileīut there are some limitations of Foxit Reader for the moment (version 2.4.4): it has no dark GUI (while not following a dark desktop theme) and no full-screen. PDF readers, beside Master PDF Editor and Zathura: text files saved/exported/printed as pdf) (A) Thus, a scanned pdf text can be read with different color profiles, just like an epub can in an ebook reader. 
With an image/scanned text, a value of #3b3537 for the page color and #b0afac for the font color gives this:
Zathura - with settings like those mentioned in this older answerĬan change color of both pages and fonts even in image-based pdf files. a book or article scanned/photocopied and saved as pdf) There are exceptions, though, viewers that can do more than just inverting colors or changing only the background: For all pdf (including image-based) files 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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