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Originally Posted by ILB
But can I use Calibre's built-in metadata jacket to add custom columns (which I maintain manually after downloading) to my title page?
And how do I update my book to do this?
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Yes, it's possible.
https://manual.calibre-ebook.com/cus...ates-et-cetera
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Overriding icons, templates, et cetera
calibre allows you to override the static resources, like icons, javascript and templates for the metadata jacket, catalogs, etc. with customized versions that you like. All static resources are stored in the resources sub-folder of the calibre install location. On Windows, this is usually C:\Program Files\Calibre2\resources. On macOS, /Applications/calibre.app/Contents/Resources/resources/. On linux, if you are using the binary installer from the calibre website it will be /opt/calibre/resources. These paths can change depending on where you choose to install calibre.
You should not change the files in this resources folder, as your changes will get overwritten the next time you update calibre. Instead, go to Preferences → Advanced → Miscellaneous and click Open calibre configuration directory. In this configuration directory, create a sub-folder called resources and place the files you want to override in it. Place the files in the appropriate sub folders, for example place images in resources/images, etc. calibre will automatically use your custom file in preference to the built-in one the next time it is started.
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As for updating the book to insert the jacket,
Polish books (keyboard shortcut P) or conversion.
The Modify ePub plugin also allows inserting jackets into ePub however, I don't know if it includes custom columns or can be customized to do so.