Normalization of TIFF images

When I save a 2D wave as TIFF, even with the /U flag, the TIFF file seems to be normalized to maximize bit depth.

In the example below, the first print statement returns 16129, which is indeed 127*127. The second print statement, however, returns 65534. Opening the test_out.tif in something like ImageJ also gives me 65534 as the value for the [127][127] pixel, so it seems like the /U flag in the ImageSave command doesn't seem to do anything?

Or am I missing something?

Thanks!

B