Some epub books have wide margins on my Sony PRS300. Using Calibre I was able to remove margins that did not seem to respond to changing the margin settings in Calibre's "page setup" menu.
Open Calibre
Make a copy of the book you are altering (in case of serious problems with the conversion)
- Go to the drop down menu on the right of the “Add book” menu symbol and add an “empty book”.
- In the library list, select the empty book and holding down the Ctrl button select the book you want to copy (in that order!)
- With both books selected hold down Alt and M keys to make a copy of the book
Select the copy of the Book title in library
- right click the book and select “tweak epub” from the drop down menu
- Explode epub
- Delete the .XPGT file from the OEBPS folder.
- Rebuild epub
In Calibre
Select book title in library
- Click on “Convert books” to go to the conversion options page for the book
- In “page setup” set the margins to whatever you want (0 is fine if you want no margin)
- Save and upload book to reader
I also changed fonts with instructions I found here:
http://blog.the-ebook-reader.com/201...a-sony-reader/