Both the HTML file and the image MUST be marked as cover
Calibre conversion will replace a cover (when it is properly marked)
It will ADD a new cover if any of the marks are missing.
Covers (SVG wrapped) just work for so many users, that you must be fighting Calibre to get it a little more 'your way'.
Maintaining Aspect is 900% more important to me, than filling every inch of the screen.
I bought Laser Discs in the 80's because I could see movies in widescreen. So what, if there were black bars top and bottom.
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