The Microsoft Office Picture Manager is an image editing and management application that comes with Microsoft Office. It integrates with SharePoint Picture Libraries, allowing you to upload images, edit images, and send images into other Office Applications.
The application uses the sharepoint imaging.asmx web service in SharePoint 2010 to access files. When using the "Send To" command in a Picture Library it will use CheckSubwebAndList, GetItemsByIds, and Download operations to retrieve the image.
Because of the use of the imaging.asmx web service, a Picture Library is required for SharePoint integration with the Microsoft Office Picture Manager.