Hi Aaron,
the 8-bit power spectrum has logarithmic scaling; the real FFT data are invisible in the background (for doing 'inverse FFT'). If you want the true power spectrum for analysis, use Process>FFT>FFT Options and select 'raw power spectrum'. You can't do a back transform of the power spectrum, however, it lacks the phase.
Michael
________________________________________________________________
On 2013-Mar-18, at 13:34, Aaron Hendrickson wrote:
> Hello,
>
> I am trying to analyze and filter noise in images using Fourier Transforms.
> In ImageJ when you create a FFT from an image you get an 8-bit "power
> spectrum"....not the full 32-bit floating point FFT. Is there a way to get
> this uncompressed FFT?
>
> Cheers,
> Aaron Hendrickson.
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