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#2 is possible but #3 isn't unless you have a completely open bucket and that wouldn't be good.

I hate to be so self-promoting, but http://jsfiddle.net/GTYX5/2/ should do everything you're asking for

filepicker.io is cool. But your backend service wouldn't be needed if the image uploading & resizing straight to s3 could be done in the browser. Your product would simply be a javascript lib.

how do you do #2?

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