partimage was the tool you were looking for. It natively understands NTFS, FAT, extX, Reiser, XFS, etc. and can resize as it images. By default it pops up a so

partimage was the tool you were looking for. It natively understands NTFS, FAT, extX, Reiser, XFS, etc. and can resize as it images. By default it pops up a somewhat annoying ncurses interface, but it's quite a solid tool.