Save part of the screen as a jpg?

Can someone please point me to some information about saving
a rectangular part of the screen (e.g. a Canvas) as a jpg online
(using PHP)?
I have found some information in books and online about
getting images from the iSight camera, and from user-uploaded
images. But so far nothing on saving part of the Flex screen
itself. I will be working with someone using PHP.
I've got an app where the user creates artwork, and then can
save it online.

"Handycam" <[email protected]> wrote in
message
news:gd2tob$j2n$[email protected]..
> Thanks, but that article says it requires a library,
as3corelib, which is
> not available for download from the Google Code site it
links to. Any
> ideas>
http://code.google.com/p/as3corelib/source/browse/trunk/src/com/adobe/utils/DateUtil.as

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