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"Kenneth" <kdw### [at] gmail com> wrote:
> Can I assume that Photoshop uses
> > FFTs for those filters?
"Digital image processing programs, such as Photoshop, use Fourier transforms
internally to perform certain image processing functions, such as Sharpen, Blur
and high and low band pass filters."
http://qsimaging.com/ccd_noise_create_ffts.html
Check out:
http://qsimaging.com/ccd_noise_interpret_ffts.html
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