Where files are used if path entered by hand
inline_image_to_field module promises turn your inline images into an image field (image entities).


  This module will take images that are embedded (copy/paste) or were uploaded via the wysiwyg and attach them to an image field.


This way you can have your Drupal installation being fully aware of any such images and take advantage of any file or image entity related modules.

DISCLAIMER: I have not used this module and it is new module with not many installs so use with caution on your DEV environment before commiting to your LIVE environment