Hi J,
if you create an FFT-like image that is 255 for everything that you want to pass, and 0 everywhere else, you can use it for Process>FFT>Custom Filter. You can create such an image from the usual FFT with black 'pass' or white 'reject' areas by applying a suitable threshold. You should then smoothen it a bit, to avoid 'ringing' artifacts.
The 'Custom Filter' should also work on stacks.
Michael
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On Jul 9, 2014, at 17:26, jdif wrote:
> I am attempting to use ImageJ to find the FFT of a stack of similar images
> and then reverse FFT after applying the same custom drawn filter to all of
> the images.
>
> I am able to obtain the FFT of the satck using this macro:
>
> setBatchMode(true);
> stack = getImageID;
> newImage("FFT Movie of "+getTitle, "8-bit", getWidth, getHeight,
> nSlices);
> movie = getImageID;
> for (i=1; i<=nSlices; i++) {
> showProgress(i, nSlices);
> selectImage(stack);
> setSlice(i);
> run("FFT");
> run("Copy");
> close;
> selectImage(movie);
> setSlice(i);
> run("Paste");
> }
> setBatchMode(false);
>
> For individual images, I would select areas of the FFT I wanted to delete
> and then multiply them by 0 using the Process->Math function, and then RFFT
> this new image (I am doing this to remove/edit selected features from the
> original image). Is there any way I can draw this filter on one image and
> use it as a filter to apply this process to the whole stack?
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