I have a JPG which appears to of retained a clipping mask:
When this file is opened in photoshop / fireworks and then the "Paths" tab is visited, you can see the saved clipping path on the jpg. However I tried to replicate this in photoshop and couldn't replicate with a new file. How was this done? I assume it is via some form of metadata?
It seems that the clipping path could be removed when uploaded via a web based image uploader, in this case a flash based uploader.