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Increasing size of NSImage by adding padding

OK, this seems like a really simple thing, but I'm not getting it. I have an NSImage that was created from some 1-bit bitmap data using that really long NSBitmapImageRep initWithBitmapDataPlanes... method. I need to pad the image with a couple of pixels worth of whitespace all the way around.
I tried:
1. create new NSImage that is 4 pixels larger in width and height;
2. lock focus on new image
3. tell original image to compositeToPoint 2,2 (also tried dissolveToPoint and drawAtPoint)

The problem with the above is that I end up with a fuzzy looking image, I guess due to anti-aliasing. I'm guessing (hoping?) there's a much better / cleaner way of doing this so that I end up with the same bitmap, just padded with some whitespace.

Thanks,
Glen Simmons

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