If I use:
Code:
ebook-convert mybook.rtf .pdf --paper-size a5 --margin-left 18 --margin-right 18 --margin-top 18 --margin-bottom 18
then the left and right margins are 18pt, but there is no margin at the top and bottom of the page except on the first page.
ebook-convert --version gives me:
ebook-convert.exe (calibre 0.8.5)
Thanks,
John Rennie