UIGraphicsGetImageFromCurrentImageContext memory leak with previews

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The problem is this:

UIGraphicsGetImageFromCurrentImageContext()

returns an autoreleased UIImage. The autorelease pool holds on to this image until your code returns control to the runloop, which you do not do for a long time. To solve this problem, you would have to create and drain a fresh autorelease pool on every iteration (or every few iterations) of your while loop.

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