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Ok, I unpacked both, here's my findings:
The HTML for each is very similar in size; the 8MB book has an HTML file of 1,308,372 bytes and the 32MB book has an HTML file of 1,284,811, so both about 1.3MB.
The 8MB book has an "images" folder with 128 items (size of folder 7MB). The 32MB "images" folder has 161 items (size of folder 31MB).
The 32MB images are named from "image00300.jpeg" through to "image00460.jpeg".
The 8MB images are named from "image00320.jpeg" through to "image00447.jpeg".
The converted 8MB file, for some reason, is losing 20 files at the start and 13 at the end!
Also, the remaining images don't "match up" - what WAS "image00319.jpeg" in the original 32MB book is now called "image00320.jpeg" in the new 8MB book, and it's changed from 29Kb to 6Kb (it's definitely the same image, it's a diagram of a crab).
Similarly, what WAS "image00360" is now "image00322" and it's changed from 308Kb to 150Kb (yet both books still have it as 1010 x 1347 in dimension).
What I really want is an EXACT replica of the 32MB book, but with chapter markers. Anyone know of a way of doing it, even if it means using something other than Calibre?
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