Answer by Daniel Waters for Feeds: How to import images using CSV Node Import?

To extend upon commercebythegradeo's answer.There's a module available called:

Feeds Image Grabberhttps://drupal.org/project/feeds_imagegrabber

What this module does is allow you to import the specified image from the URL into the node, rather than simply referencing it. This way all your post processing can be one, which as I see it was the only real flaw in the answer provided by commercebythegradeo.