Resize (shrink) Image the safest way?

[Skywatch]

Hi all,

I have an 8GB image that I would now like to fit onto a new 4GB card.

I've had a look on the net but it's confusing and I can't seem to find anything specific to Xbian.

So what is the best/safest way to do this? Use Gparted on the card to shrink and re-save the image prior to writing to the new card?

Any hints or help greatly appreciated :-)

Skywatch