digital zoom iphone / digital zoom general [closed]

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Anyone has sample code or know of a tutorial on how to do a digital zoom for an iphone? or dig开发者_运维问答ital zoom in general?

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The crudest forms of digital zooms simply scale an image larger and crop to a certain visible region. On the iPhone, you can do this easily by capturing an image from the camera, placing it in a UIImageView, and applying a scaling transform to the view.

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Consider these Categories for NSImage for ways in which you can zoom and crop an image in Objective-C.