No arguments
Description:
Compute the pointwise sign of selected images.
Examples of use:
• Example #1
• Example #2
$ gmic 300,1,1,1,'cos(20*x/w+u)' +sign display_graph 400,300

Command: 300,1,1,1,'cos(20*x/w+u)' +sign display_graph 400,300

Command: 300,1,1,1,'cos(20*x/w+u)' +sign display_graph 400,300