Vincent

@papiend Yes, we are in the same situation. I've searched too, but someone with good coding knowledge needs help. I hope a solution is found.

You're amazing Ollie, I'm so glad to see this message. It was exactly the algorithm and drawing style I needed to “create gradations without multiple pencils”. I'm counting on you...

The option to have lines only in the portrait, without the lines in the background like other filters in DrawingBot software, would be great.

 Here is an example of a picture I drew with the ChiuEtAl algorithm earlier. There are no lines in the white areas. It's the same thing we're talking...

Well, I can send the file if you need it.