drop_shadow
Arguments:
- _offset_x[%],_offset_y[%],_smoothness[%]>=0,0<=_curvature<=1,_expand_size={ 0 | 1 }
Description:
Drop shadow behind selected images.
Default values:
offset_x=20, offset_y=offset_x, smoothness=5, curvature=0 and expand_size=1.
Example of use:
$ gmic
image.jpg drop_shadow 10,20,5,0.5 expand_xy 20,0 display_rgba

Command:
image.jpg drop_shadow 10,20,5,0.5 expand_xy 20,0 display_rgba