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There is a nice utility called pdftk for combining pdf files, extracting portions of pdf files, and other routine conversions. Is there something similar that works on djvu format?

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I don't know how well it compares to pdftk, but there is Djvulibre. A quick overview of the tools it comes with:

  • c44: a wavelet-based continuous-tone image encoder (à la JPEG-2000).
  • cjb2: single page encoder for bitonal images (black and white scans).
  • cpaldjvu: encoder for palettized images (a la GIF, but better).
  • bzz: a general-purpose data compressor (a la bzip2).
  • djvused: a powerful command interpreter for manipulating DjVu documents.
  • ddjvu: converts DjVu documents to PBM/PGM/PPM images.
  • djvudump: displays the structure of a DjVu file.
  • djvuextract: extracts chunks from a DjVu file.
  • djvumake: assemble chunks into a DjVu file
  • djvutxt: extract the "hidden text" from a previously OCRed DjVu document.

You can install the djvulibre tool-suite on Ubuntu with:

sudo apt-get install djvulibre-bin

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