FFT of a stack possible?

Hi, i have a stack and want to do a FFT of the whole stack so that i can see the change in the spectrum as a function of time, is it possible?

thanks in Advance!

Joachim

Here is a macro that does this:

    setBatchMode(true);
    stack = getImageID;
    n = nSlices;
    for (i=1; i<=n; i++) {
       selectImage(stack);
       setSlice(i);
       run("FFT"); 
    }
    run("Images to Stack", "name=[FFT Stack] title=FFT");
    setBatchMode(false);
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