Painterly Rendering with Curved Brush Strokes of Multiple
Sizes
Media Research Laboratory
Department of Computer
Science
Courant Institute of
Mathematical Sciences
New York University
Abstract
We present a new method for creating an image with a hand-painted
appearance from a photograph, and a new approach to designing
styles of illustration. We paint an image with a series of spline
brush strokes. Brush strokes are chosen to match colors in a source
image. A painting is built up in a series of layers, starting with
a rough sketch drawn with a large brush. The sketch is painted over
with progressively smaller brushes, but only in areas where the
sketch differs from the blurred source image. Thus, visual emphasis
in the painting corresponds roughly to the spatial energy present
in the source image. We demonstrate a technique for painting with
long, curved brush strokes, aligned to normals of image gradients.
Thus we begin to explore the expressive quality of complex brush
strokes.
Rather than process images with a single manner of painting, we
present a framework for describing a wide range of visual styles. A
style is described as an intuitive set of parameters to the
painting algorithm that a designer can adjust to vary the style of
painting. We show examples of images rendered with different
styles, and discuss long-term goals for expressive rendering styles
as a general-purpose design tool for artists and animators.
SIGGRAPH 98 paper:
PDF (400kb)
Project Page: Painterly
rendering
Project Page: Non-photorealistic
rendering
Copyright © 2000 Aaron Hertzmann