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A thing I do with AZW and ePub comics is to export them as ZIP files from Calibre and process them with command line tools: ImageMagick if I want to resize or convert to greyscale, optipng and jpegtran to optimize files. Repack as a CBZ and import back into Calibre. I keep both the original and the procesed formats in my library. Not the most efficient and there's probably an all-in-one tool out there that can do it more easily but this has worked for me for years.
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