Probably you'd want to have a flash uploader app maybe.
I think browser security is too high with javascript, and won't let it touch
anything on the file system.
What sort of processing do you want to do ?
I saw one thing that I think would let you pass a filename (not in an upload
box) then in javascript set the <img src="file:///some/image.jpg" ..
Then it would do resizes and stuff all on the image's canvas, and could
trasmit the image canvas data of the image rather than the file upload.
But of course that'd only work on browsers that support html5 canvas and any
other canvas like thing you care to code the JS for.
html5canvas:
http://www.html5canvastutorials.com/advanced/html5-canvas-get-image-data-tutorial/
and maybe this JS library for Internet Exploder:
http://code.google.com/p/explorercanvas/
I can't remember the name of the library thing, but I'm sure you'll find
something googling :)
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