I have no idea if it does what you want, but it can do things that are not implied by either the name, or description. For a bunch of books you could use the command line ebook-convert tool to do the EPUB ->ZIP conversion, and do the ZIP->CBZ rename in a. If I'm wrong on this front, I'd appreciate any info about the CBR/CBZ standard. This is what I'd do - open the book folder, drag the ZIP to the desktop, close the book folder, rename the ZIP to CBZ, drag it back to the Book details panel and then delete the ZIP. It looks like it's literally just a Zip Archive or RAR Archive of images, with the first chronologically-named image serving as the comic's cover. Has anyone created a plugin/conversion option that would let me do this within Calibre? I am sure this might result in some missing metadata, but I did try googling around, and as far as I'm aware there is no established "standard" for CBR/CBZ files for metadata files, etc.
This is trivial to do, but quite time-consuming. I've found that I can manually make a CBZ file from a comic source EPUB by just yanking the "Images" directory out of the extracted EPUB, zipping it up, and renaming it to a. I'd prefer to just have them as generic CBR/CBZ files, though, so that I can leverage the dedicated comic-book reader apps on my tablet.
My use-case is that I have a bunch of digital comics I purchased from a vendor (we'll call them "Rainforest") and then stripped the DRM to get an EPUB. I did a thread search before posting this, and I see alot of articles on converting CBZ -> EPUB, but nothing on the reverse.
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