>>Only Fourier methods can possibly unify this type of filtering You are wrong in this. The last 60 years of signal processing history involve developing metho

>>Only Fourier methods can possibly unify this type of filtering You are wrong in this. The last 60 years of signal processing history involve developing methods that are improvements on the FT. >>It might be thought that Fourier methods are too hard for a graphic designer to understand Fourier methods are bad because they are the least efficient basis to represent your image. It is not intuitive to increase the gain of the low frequencies when you want to increase something like the shadow. There is no mapping between features in an object and the Fourier domain. More advanced, spatial domain techniques might be appropriate and these already exist and are being used by graphics design professionals.