Has anyone played with OIIO's FFT functions? I've not worked with this
much, but what I'm used to seeing out of the FFT is an image with a white
pixel in the center and some matter of pixels around those.

(For instance: http://homepages.inf.ed.ac.uk/rbf/HIPR2/fourier.htm)

What I get out of OIIO is an image with interesting bits in the 4 corners
and nothing in the middle. Am I right to interpret pixel (0,0) as the
lowest frequency in X and Y and pixel (max,max) as the highest frequency in
both X and Y?

--jono
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