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Hi George,
no such problem under 1..46n22, OS X 10.6.8 here.
Maybe, when filtering the FFT, you have modified brightness and contrast?
Fourier filtering by editing the image works only if the pixel values are 0 (suppress) or 255 (pass). It is not enough if the selected area appears white or black because B&C are set in a way that shows it as black or white.
Note that the drawing tools, delete and fill set *color* to the foreground or background color. If 'white' does not correspond to 255, they won't set anything to 255. Same for black and 0.
Also make sure that the foreground and background colors are really black and white (double click the eyedropper and click on the black rectangle at the bottom).
Michael
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On May 10, 2012, at 21:37, George Reis wrote:
> I use the FFT to remove repeating patterns from images. I've done this for years, and suddenly the Inverse FFT is now returning a copy of the original image with no changes! That is, I run the FFT, mark my points, then run Inverse FFT, and the new image is identical to the original with the pattern still in place.
>
> This is on a Mac 10.6.8 using several versions of ImageJ, including, 1.36b, and both 32 and 64 bit versions of 1.45s.
>
> Any ideas as to what caused this and what the fix is?
>
> TIA,
>
> George
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