[hfpop]

@eschwartz: Thanks for the info.

(1) I try to make heads and tails of kindlegen and calibre conversions between ebook filetypes.

Other than the compression algorithms that are used, there is another problem: the fonts size of the books are not the same, with the default settings used. All examples below start from DOCX -> HTML filtered. Then:

HTML -> (kindlegen) -> MOBI (0)
HTML -> (calibre) -> EPUB (1) and MOBI (1)
EPUB (1) -> (kindlegen) -> MOBI (2)
MOBI (1) -> (calibre) -> AZW3 (1)

Strangely, the fonts displayed in Kindle Voyage are in the following relation:
MOBI (0) = AZW (1) > MOBI (1) > MOBI (2)
i.e. even using calibre only, MOBI -> AZW3 increases the font to what appears to be the "standard".

I am certain that this picture is incomplete. Still, what can I do with my workflow to ensure that all files use the fonts at the same size? Is this a MOBI problem? And AZW3 is less prone to these font size jumps?

(2) From what Voyage is concerned, Calibre creates books, with default covers; Kindlegen creates documents (not books) with proper covers. All the books are manually sideloaded via USB (i.e. not via Calibre). I am fine with Calibre behavior, I would personally remove the covers altogether: it's about books, not cover art.

Thank you for your thoughts on this.