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The shape index describes the surface topology of the image interpreted as a height field:
|meaning||cap||dome||ridge||saddle ridge||saddle||saddle rut||rut||trough||cup|
The shape index is calculated from the principal curvatures of the Hessian, which is very susceptible to noise. Therefore the plugin asks you to specify a radius for Gaussian blurring as a preprocessing step.
With radius 2, this results in the following shape index map (bright spots correspond to caps, dark to cups):