| ButterworthHighPass | Applies a Butterworth high pass filter to an image. |
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| ButterworthLowPass | Applies a Butterworth low pass filter to an image. |
| IdealHighPass | Applies an ideal high pass filter to an image. |
| IdealLowPass | Applies an ideal low pass filter to an image. |
| MakeSinusoid | Generates synthetic images in which grey level has a sinusoidal variation horizontally, vertically or in both directions. |
| SpectralProbe | Displays an image and the spectrum of a small square region of that image, defined by the user. |
| Spectrum | Computes the amplitude spectrum of an image, windowing if required, and writes it to a file as an image. |
| SpectrumViewer | Displays an image and its spectrum side-by-side. |