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There are two work-arounds: IF your library catalog is NOT huge THEN you can simply edit the (.epub or .azw3) catalog (select the catalog then press the t key. A window will open with the contents of the file organized into folders. Scroll down to images and delete every image in the file.
Editing works fine for modest-sized libraries but once the file > than (about) 100 mb's, Calibre becomes glacially slow at editing it.
The OTHER alternative is based upon the concept that a .epub file is actually just a .zip file. So you can change the catalog's .epub extension to .zip and extract it to a new folder. Among the extracted contents will be a folder called images. Delete its contents, rezip everything else (including the empty images folder) and change the .zip extension back to .epub, Use Calibre to convert that .epub into your e-reader's format of choice.
This is a very simple process but it takes a very long time and it would be nice if Calibre added the ability to disable images in the catalog. As I've requested. Multiple times over the years. So far, no joy.
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