I was interested in finding out what Profiles are too, couldn't find anything in the forum, and the only thing I got from the manual was this:
http://calibre.kovidgoyal.net/user_m...hlight=profile
The important part:
"Affects conversion of font sizes, image rescaling and rasterization of tables"
Don't understand why, for instance, a mobi file needs to be made for a Kindle compared to another reader. It's a mobi, it should be pretty much the same (very similar at least) in all mobi readers, right?