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I'm curious to see how designers have addressed this problem on a touch-screen device given the size and technical constraints of mobile.

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What exactly are you asking? There's no answerable question here. – Charles Boyung Apr 22 '11 at 13:13
up vote 3 down vote accepted

Facebook has this. When you use an image for your profile you use the "pinch" gesture to crop.

I have seen others do a box that has one edge draggle (to expand the box larger) then you move the box (tap and drag the center) over the area.

I actually like the second option myself.

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Thanks for the example, this is more of an IxD question that I've been wanting to code up. I'll let you know when I get around to making it. – MatthewForr Jun 6 '11 at 18:15

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