The export location of the images is where the images live once they are actually installed into the magento website. The import path is different. If you are importing via magento's import the images need to be in /media/import ( see http://stackoverflow.com/questions/18486990/magento-importing-imageshttps://stackoverflow.com/questions/18486990/magento-importing-images )
Using Magmi, you can pretty much define any path you want to the import images (Magmi is MUCH better than default magento at this), but there are a few rules in notation in the magmi csv format. Basically you can define the path to the thumbnail, small and large images, you can add a + or - at the front of the path to say if the image should be included in the media library for the product (ie will it be included in the product page as an alternate view) and finally you can add lists of images to the media library by listing image import paths separated by semicolons.
There is fine documentation on this in the magmi online help here ( http://wiki.magmi.org/index.php?title=Main_Page )