Alright, I've searched the thread and can't find the answer to my question.
The problem: I've been running into (with much more frequency in the last few months) fanfics that are increasingly large in size due to pictures and almost always PNGs. I've actually had to manually edit some.
An extreme example of one (was on royalroad, now on scribblehub) is Sleeping Princess by Yairy (
http://www.scribblehub.com/series/12...ping-princess/) it has hundreds of images some in JPG and many in PNG format... and in fact at last download was over 1200MB... I manually edited the file and changed all the images to JPG and suddenly I'm at 70ish MB.
I had to do this (manually convert the images and edit the HTML) to a few dozen fanfics when I put them on my new Kobo (went from 32gb (kindle) to 8gb on my Kobo) I dont remember all of the fics I modified, so I can't name them all off, but it was semi-frequent and most of them where newer fanfics.
So the question: Is there some sort of mechanism in FFF to auto-convert images to jpg (and possibly reduce large images)? If not, is there a way to do it without converting to mobi and then BACK to epub (which destroys the usability of it with FFF)?