Re: FFT Power Spectrum Question: RGB vs 8-bit stack

Posted by Gabriel Landini on Jul 28, 2013; 8:48am
URL: http://imagej.273.s1.nabble.com/FFT-Power-Spectrum-Question-RGB-vs-8-bit-stack-tp5004177p5004189.html

On Sunday 28 Jul 2013 09:33:59Jack Hogan wrote:
> Thanks, your suggestion seemed promising.  I produced both the FFT of the
> quadrature sum of the R,G and B values and the quadrature sum of the
> individual channels' Power Spectrum.  The Power Spectrum obtained by IJ's
> FFT function directly on the RGB image looks closest to the latter (see the
> rightmost column in the FFT Moduli image), but alas nowhere near the same
> as you can see in the two attachments.
>
> Getting closer but not quite there yet.  Any other ideas?

I would stop experimenting and look in the source code. Even if it looks very
close, you will not be sure that what you do is what the code does.

Cheers
Gabriel

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