Abstract
When painting a townscape with watercolor, we first make a line drawing of townscape and paint it with transparent watercolor on it. In this case, if the line drawing is created by perfect lines, it becomes work like coloring, the consciousness to draw a picture is hard to born, and it is difficult to become a unique expression as well. Instead of extraction technology, we created a line drawing with SIC(Synergistic Image Creator). As a result, it was possible to create a sketch with incomplete outlines like human handwriting. We also proposed a method of teaching watercolor painting which uses this line drawing functionally.
