Arguments:
- { x | y | z }...{ x | y | z },_scheme or
- (no arg)
Description:
Compute the gradient components (first derivatives) of selected images.
(equivalent to shortcut command g).
scheme can be
{ -1=backward | 0=centered | 1=forward | 2=sobel | 3=rotation-invariant (default) | 4=deriche | 5=vanvliet }.
(no arg) compute all significant components.
Default values:
scheme=0.
This command has a tutorial page.
Example of use: