Как конвертировать djvu в pdf и сохранить оглавление, как это возможно?

update: user3124688 has coded up this process in the script dpsprep.

I don't know of any tools that will do the conversion for you. You certainly should be able to do it, but it might take a little work. I'll outline the basic process. You'll need the open source command line utilities pdftk and djvused (part of DjVuLibre). These are available from your package manager (GNU/Linux) or their websites (Windows, OS X).

• step 1: convert the file text

  First, use any tool to convert the DJVU file to a PDF (without bookmarks).

  Suppose the files are called filename.djvu and filename.pdf.

• step 2: extract DJVU outline

  Next, output the DJVU outline data to a file, like this:

  djvused "filename.djvu" -e 'print-outline' > bmarks.out 

  This is a file listing the DJVU documents bookmarks in a serialized tree format. In fact it's just a SEXPR, and can be easily parsed. The format is as follows:

  file ::= (bookmarks <bookmark>*) bookmark ::= (name page <bookmark>*) name ::= "<character>*" page ::= "#<digit>+" 

  For example:

  (bookmarks ("bmark1" "#1") ("bmark2" "#5" ("bmark2subbmark1" "#6") ("bmark2subbmark2" "#7")) ("bmark3" "#9" ...)) 

• step 3: convert DJVU outline to PDF metadata format

  Now, we need to convert these bookmarks into the format required by PDF metadata. This file has format:

  file ::= <entry>* entry ::= BookmarkBegin BookmarkTitle: <title> BookmarkLevel: <number> BookmarkPageNumber: <number> title ::= <character>* 

  So our example would become:

   BookmarkBegin BookmarkTitle: bmark1 BookmarkLevel: 1 BookmarkPageNumber: 1 BookmarkBegin BookmarkTitle: bmark2 BookmarkLevel: 1 BookmarkPageNumber: 5 BookmarkBegin BookmarkTitle: bmark2subbmark1 BookmarkLevel: 2 BookmarkPageNumber: 6 BookmarkBegin BookmarkTitle: bmark2subbmark2 BookmarkLevel: 2 BookmarkPageNumber: 7 BookmarkBegin BookmarkTitle: bmark3 BookmarkLevel: 1 BookmarkPageNumber: 9 

  Basically, you just need to write a script to walk the SEXPR tree, keeping track of the level, and output the name, page number and level of each entry it comes to, in the correct format.

• step 4: extract PDF metadata and splice in converted bookmarks

  Once you've got the converted list, output the PDF metadata from your converted PDF file:

  pdftk "filename.pdf" dump_data > pdfmetadata.out 

  Now, open the file and find the line that begins: NumberOfPages:

  insert the converted bookmarks after this line. Save the new file as pdfmetadata.in

• step 5: create PDF with bookmarks

  Now we can create a new PDF file incorporating this metadata:

  pdftk "filename.pdf" update_info "pdfmetadata.in" output out.pdf 

  The file out.pdf should be a copy of your PDF with the bookmarks imported from the DJVU file.

Основываясь на очень четкой схеме, приведенной выше пользователем @pyrocrasty (спасибо!), Я реализовал конвертер DJVU в PDF, который сохраняет как текст OCR, так и структуру закладок. Вы можете найти это здесь:

https://github.com/kcroker/dpsprep

Благодарности за данные OCR можно найти на @zetah на форумах Ubuntu!