This plugin offers wordpress administrator a method of updating all of their blog images at once after changes have been made to the Media Upload settings.
Once this plugin installed, you will find a new link at “Media” in Admin Menu. This link is called “Scan Images”. Click this link and then click the “Start Scan” button. This will scan every single image attachment on wordpress installation. Report items with a green header are in “Perfect Condition” while items with a red background are incorrect and may or may not be resizable by wordpress.
Requires WordPress Version: 2.8.6 or higher