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gradient

Arguments:

• { x | y | z | c }...{ x | y | z | c },_scheme,_boundary_conditions    or
• (no arg)

Description:

Compute the gradient components (first derivatives) of selected images, along specified axes.

(equivalent to shortcut command g).

scheme can be { -1:backward | 0:centered | 1:forward | 2:sobel | 3:rotation-invariant (default) | 4:deriche | 5:vanvliet }.
boundary_conditions can be { 0:dirichlet | 1:neumann | 2:periodic | 3:mirror }.
(no arg) compute all significant components.

Default values:

scheme=0 and boundary_conditions=1.

This command has a tutorial page.

Example of use: