Generally, 'edge extraction, edge detection, edge filters -' in a feature called, 'Sobel, Laplacian (3x3)' comes with such an algorithm.
:No.19 - Edge detection
B3:Line 1 - Converts the color line drawings.
Free Online Photo Editor | Photo-kako.com
This website is a free online photo editor. You can edit your pictures and apply photo effects. This photo editing software has several unique digital image processing apps. It's one of the most popular free online photo editors in Japan. You can use output images for anything.