actually what u could do is use rasterfarian. have a look for manga2ebook and it will put u on its trail. what it does is, manga2ebook can be used to convert cbr/cbz to pdf, though it will mess up the sequence, so calibre does a better job. that pdf is a scanned pdf. rasterfairan is a separate tool, which will rasterize and CONDENSE a pdf. i.e. on a 1.5 GB color pdf from a comicbook, u may happen to be able to obtain a lrf which is abt 200 MB, which is dramatic. speed should be ok then. but the results are not always the same. if u have a BW pdf which is almost without shades already, reduction maybe will only achieve 50% reduction.
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