Average the images first, then do the FFT. Yes, you will get the same
> I did a search on the list archive and fft yielded nothing, something I
> seriously doubt is the case. I used
>
https://list.nih.gov/cgi-bin/wa.exe>
> In any event, I can use Imagej to take the FFT of an image without issue.
> Both the "FFT window" and "complex FFT" work. But what I'd like to do is
> to average a few FFTs of some images, then take the inverse of that
> result.
>
> You can put the "FFT Window" images into a stack, but it just saves the 2D
> magitude, so when you average the slices, the result cannot be put through
> the inverse FFT.
>
> Using the complex FFT, I cam create a stack of real and a stack of
> imaginary, average each stack individually, but then the inverse FFT
> doesn't recognize it as a complex image.
>