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dicing djvu documents

I have this relic from the last time I tried plumbing to make djvu
files.

tom@del:~/bin$ cat pgm2djvu
cat $1 | erode | pgmtopbm | pbmtodjvurle | csepdjvu -d 300 - $2


Now I want to slice a djvu file into four quadrants, and put each
quadrant in a separate file.

1. How to unpack a djvu document into separate png/pam files?

  ddjvu



2. How to ... pdf

   * generate pgms: pdftoppm -gray doc.pdf pageprefix

   * pipe them through: | pnmcrop | pgmtopbm | pbmtodjvurle | csepdjvu -d 150 - |

   * pack djvus:  djvm -c lazy-peval.djvu *.pgm.djvu



3. djvu again:

   pdftoppm -r 300 -gray doc.pdf pageprefix

   cjb2 is the encoder from djvu-libre




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