It also supports a rich variety of formats, even comic ones, can rotate pages, and has a rich set of navigation tabs. To change the contrast, brightness and gamma of a document you are viewing, go to View | Settings. It is available only as x86, but still works great under Win7 圆4. In fact, it defaults to page width, continuous view as all PDF readers and PDFs in general always should. It has the ability to select and copy text, as well as do a continuous view. STDU Viewer: This is no longer actively maintained with the last update being in or before 2015.It supports a wide variety of formats and has a lot of ability to rotate the view as well. To change the contrast, brightness and gamma of a document you are viewing, click the Options gear on the toolbar on the upper right, and choose the Image Adjustment tab. It does display PDF files, but seems to lack such staple PDF viewing abilities as selecting and copying text, and a continuous view. YACReader: It is actively maintained, but is specialized for comic book formats.I've found two PDF readers that allow you to change brightness, contrast and gamma for PDFs from scans:
