PIL: TIFF images loaded as 16 bit signed integers

I'm running into a problem where my image intensities are being loaded
as 16 bit signed integers.  The code I'm using to open the tiff file
is:


im = Image.open(file)
self.pixels = np.array([im.getdata()], np.uint16)

the filetype is a 16bit TIFF, whose intensities load fine into ImageJ.
 I load their intensities into a numpy 16bit array, and for the time
being I've fixed this problem with this code:

np.where(self.pixels<0, -1*self.pixels+(32768+self.pixels),self.pixels)

That basically takes any negative values and compensates for the
rollover.  Does anyone have any idea why PIL is loading my TIFF files
as signed integers?
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