hardsketchbw
Arguments:
- _amplitude>=0,_density>=0,_opacity,0<=_edge_threshold<=100,_is_fast={ 0 | 1 }
Description:
Apply hard B&W sketch effect on selected images.
Default values:
amplitude=1000, sampling=3, opacity=0.1, edge_threshold=20 and is_fast=0.
Example of use:
$ gmic
image.jpg +hardsketchbw 200,70,0.1,10 median[-1] 2 +local reverse blur[-1] 3 blend[-2,-1] overlay endlocal

Command:
image.jpg +hardsketchbw 200,70,0.1,10 median[-1] 2 +local reverse blur[-1] 3 blend[-2,-1] overlay endlocal

Command:
image.jpg +hardsketchbw 200,70,0.1,10 median[-1] 2 +local reverse blur[-1] 3 blend[-2,-1] overlay endlocal

Command:
image.jpg +hardsketchbw 200,70,0.1,10 median[-1] 2 +local reverse blur[-1] 3 blend[-2,-1] overlay endlocal