Specifies the number of pages to be included in a shared dictionary file (*.djbz). The value you assign to this option represents the number of pages you want to include in a shared dictionary. For most documents, a value of 20 is the maximum before file size is no longer affected. Some documents do not gain from shared dictionaries because they do not contain repeating shapes. For these types of documents, a value of 1 should be used to disable the use of shared dictionaries. The default value for this option is 20.
Using larger values decreases file size (somewhat), but results in larger shared dictionaries that need to be loaded upfront when browsing DjVu® files. This may lead to slower browsing over slow connections.
Example:
pdftodjvu
--pages-per-dict=1 document.pdf [document.djvu]