Quote:
Originally Posted by derangedhermit
If I update metadata in an epub in Calibre, is that update immediately applied to the metadata in the epub itself, or is the epub unchanged and the update kept somewhere else until some later time, like "Write to disk' or "Send to Device"?
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Changes are only embedded in the epub upon the book being exported from the library using Send to Device, Save to Disk, email, or content server.
Quote:
Originally Posted by derangedhermit
What about when I download or otherwise change covers? Is the old cover immediately deleted from the epub, or is it retained and the new one marked as an update and stored separately for later? Furthermore, does changing covers actually change what Calibre thinks is the old cover, or is something else going on?
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The cover is the same as any other metadata and is only updated when the book is exported from the library. Sometimes though a book will not have a proper cover identified in it and exporting the book will not update the cover.
Quote:
Originally Posted by derangedhermit
When is a "conversion" (e.g. epub-epub) required to get changes to stick?
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Never, but if for some reason the cover does not "stick" you would be best served by using the
Modify ePub Plugin to update the cover.
Quote:
Originally Posted by derangedhermit
Epubs don't need these as external files - why is it the default, and what is lost if you set Calibre to just write out the standard epub (zip) file alone?
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Nothing is lost.
Quote:
Originally Posted by derangedhermit
Last, what specific settings are needed to prevent Calibre from adding its own html (or modifying the existing html) on import, conversion, and export (output)?
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It is probably best to learn about the conversion process by reading
this section of the manual.