To scan books containing just text, black&white images and clear borders, the workflow I've been using is: digitize the source using a camera or just a scanner use scantailor finally use ...
Suppose a pdf file has OCRed text. How can we convert it to a djvu file and pass the OCRed text to the djvu file? Conversely, if exchange "pdf" and "djvu" in the above? Thanks!
For pdf files, I use Xournal to add comments, draw underlines and highlight texts in pdf files. I wonder what applications I can use to annotate djvu files? My OS is Ubuntu. Thanks!