you cannot save anything directly to the local system with FLEX.
you may have following sequence:
- display browser's open dialogbox local image ( use filereference )
- upload to server
- get the image to edit
- save the content to server
- display browser's save dialogbox ( use filereference )
* for editing the image in flex, refer to: http://fainducomponents.s3.amazonaws.com/EditImageExample03.html ( however, i have not used it )