FWIW, I hand roll mine into epub format, then convert
that through kindlegen for upload.
That meant that instead of 1280 px wide, I might as well format my own images at 1000px wide (because KindleGen rules: it WILL process the images whether I like it or not — nothing gets on the Kindle store unless it's gone
through a KindleGen processing), and control the quality at the same time.
Even if you export as an ePub3, and then run the file
through KindleGen, it will still convert the files to jpegs; but it might have problems doing it.
Then, we will discuss best practices you can use when creating your ePub files that will allow them to auto - convert to the Kindle format
through KindleGen.
Not exact matches
KindleGen is a command line tool used to build eBooks that can be sold
through Amazon's Kindle platform.
They came
through with a small change to the final release version of
KindleGen that allows the use of negative values in the text - indent CSS property.