Thread: How to create double page from 2 pages (epub)
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Old 05-28-2018, 01:00 AM   #2
kovidgoyal
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calibre does not contain any facility for this. You'd have to use some dedicated image processing tool to manipulate the image files. You can use calibre's unpack book tool to get the image files out of the epub, manipulate them using imagemagick or similar, then zip them up and rename the zip file to .cbz

Then finally, use calibre to convert the CBZ back to EPUB.
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